Contract 0x36be28fd7ba9a610b1ff3866f2dc9b7807c6ee4e 4

/**
 *Submitted for verification at polygonscan.com on 2021-06-30
*/

pragma solidity ^0.7.6;


/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}


/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}



/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
abstract contract ERC165 is IERC165 {
    /*
     * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
     */
    bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;

    /**
     * @dev Mapping of interface ids to whether or not it's supported.
     */
    mapping(bytes4 => bool) private _supportedInterfaces;

    constructor () internal {
        // Derived contracts need only register support for their own interfaces,
        // we register support for ERC165 itself here
        _registerInterface(_INTERFACE_ID_ERC165);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     *
     * Time complexity O(1), guaranteed to always use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return _supportedInterfaces[interfaceId];
    }

    /**
     * @dev Registers the contract as an implementer of the interface defined by
     * `interfaceId`. Support of the actual ERC165 interface is automatic and
     * registering its interface id is not required.
     *
     * See {IERC165-supportsInterface}.
     *
     * Requirements:
     *
     * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
     */
    function _registerInterface(bytes4 interfaceId) internal virtual {
        require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
        _supportedInterfaces[interfaceId] = true;
    }
}


/**
 * _Available since v3.1._
 */
interface IERC1155Receiver is IERC165 {

    /**
        @dev Handles the receipt of a single ERC1155 token type. This function is
        called at the end of a `safeTransferFrom` after the balance has been updated.
        To accept the transfer, this must return
        `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
        (i.e. 0xf23a6e61, or its own function selector).
        @param operator The address which initiated the transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param id The ID of the token being transferred
        @param value The amount of tokens being transferred
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
    */
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    )
        external
        returns(bytes4);

    /**
        @dev Handles the receipt of a multiple ERC1155 token types. This function
        is called at the end of a `safeBatchTransferFrom` after the balances have
        been updated. To accept the transfer(s), this must return
        `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
        (i.e. 0xbc197c81, or its own function selector).
        @param operator The address which initiated the batch transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param ids An array containing ids of each token being transferred (order and length must match values array)
        @param values An array containing amounts of each token being transferred (order and length must match ids array)
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
    */
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    )
        external
        returns(bytes4);
}


/**
 * @dev _Available since v3.1._
 */
abstract contract ERC1155Receiver is ERC165, IERC1155Receiver {
    constructor() internal {
        _registerInterface(
            ERC1155Receiver(address(0)).onERC1155Received.selector ^
            ERC1155Receiver(address(0)).onERC1155BatchReceived.selector
        );
    }
}


/**
 * @dev _Available since v3.1._
 */
contract ERC1155Holder is ERC1155Receiver {
    function onERC1155Received(address, address, uint256, uint256, bytes memory) public virtual override returns (bytes4) {
        return this.onERC1155Received.selector;
    }

    function onERC1155BatchReceived(address, address, uint256[] memory, uint256[] memory, bytes memory) public virtual override returns (bytes4) {
        return this.onERC1155BatchReceived.selector;
    }
}


abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}




library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}


/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}


/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}


/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}


// interface of momiji token.
interface IMomijiToken {
    function tokenQuantityWithId(uint256 tokenId) view external returns(uint256);
    function tokenMaxQuantityWithId(uint256 tokenId) view external returns(uint256);
    function mintManuallyQuantityWithId(uint256 tokenId) view external returns(uint256);
    function creators(uint256 tokenId) view external returns(address);
    function removeMintManuallyQuantity(uint256 tokenId, uint256 amount) external;
    function addMintManuallyQuantity(uint256 tokenId, uint256 amount) external;
    function mint(uint256 tokenId, address to, uint256 quantity, bytes memory data) external;
    function balanceOf(address account, uint256 id) external view returns (uint256);
    function safeTransferFrom(address from, address to, uint256 id, uint256 amount, bytes memory data) external;
}

contract ChainbindersMelt is Ownable, ERC1155Holder {
    using SafeMath for uint256;
    using Address for address;
    using SafeERC20 for IERC20;

    // Level enum of chainbinders NFTs total 7
    enum NftLevel {
        Legendary,
        Ethereal,
        Mythic,
        Rare,
        Common,
        Secret,
        Failed
    }

    // What rate of ETH does each level have.
    mapping(NftLevel => uint256) public nftRatio;
    // How many cards does each level of NFT have.
    mapping(NftLevel => uint256) public nftCardAmountOfLevel;
    // How much ETH does each level NFT levl have.
    mapping(NftLevel => uint256) public ethAmountOfLevel;
    // Which cards exist
    mapping(uint256 => bool) public cardExists;
    // Which level the current card belongs to
    mapping(uint256 => NftLevel) public cardLevelWithId;
    // Supply of current card with a specify tokenId
    mapping(uint256 => uint256) public cardAmounWithId;
    // How much azuki need to burn fo per token.
    mapping(NftLevel => uint256) public azukiBurnAmountOfLevel;

    IERC20 public immutable weth;
    IERC20 public immutable azuki;
    IMomijiToken public immutable momiji;
    bool public isStarted;
    address public dokiBuybackAccount;
    address public auzkiBurnAccount;

    event Melt(address indexed burner, uint256 indexed cardId, uint256 count, uint256 azukiBurned, uint256 forUserAmount, uint256 forDokibuybackAmount);
    event ChangeAzukiPriceForMelt(uint256 forLegendary, uint256 forEthereal, uint256 forMythic, uint256 forRare, uint256 forCommon, uint256 forSecret);
    event CardAdded(uint256 indexed cardId, uint256 additionalSupply, NftLevel indexed nftLevel);
    event CardRemoved(uint256 indexed cardId, uint256 removedAmount);
    event SetupRarityLevel(NftLevel indexed nftLevel, uint256 ethAmountOfLevel, uint256 poolRatio, uint256 azukiRequiredForMelt);

    constructor(IERC20 _weth, IERC20 _azuki, IMomijiToken _momiji) {
        isStarted = false;
        weth = _weth;
        azuki = _azuki;
        momiji = _momiji;
        dokiBuybackAccount = 0xc91ca8DC020F0135Df86c1D88d4CDC9caF9982Da;
        auzkiBurnAccount = 0x6dC9950905BAcA54Ccc97e4A0D0F24D9611B46ef;
        _setupRarityLevel();
        _setupAzukiBurnAmountOfLevel();
    }

    // set the percentage of ETH in the pool of every level.
    function _setupRarityLevel() private {
        nftRatio[NftLevel.Legendary] = 28; // 28% ETH in the pool
        nftRatio[NftLevel.Ethereal] = 26; // 26% ETH in the pool
        nftRatio[NftLevel.Mythic] = 20; // 20% ETH in the pool
        nftRatio[NftLevel.Rare] = 15; // 15% ETH in the pool
        nftRatio[NftLevel.Common] = 10; // 10% ETH in the pool
        nftRatio[NftLevel.Secret] = 1; // 1% ETH in the pool
        nftRatio[NftLevel.Failed] = 0;
    }

    // set the burn amount if AZUKI when unbind NFTs
    function _setupAzukiBurnAmountOfLevel() private {
        uint256 forLegendary = 100; // For Legendary it should burn 100 AZUKI
        azukiBurnAmountOfLevel[NftLevel.Legendary] = forLegendary.mul(1e18);
        uint256 forEthereal = 25; // For Ethereal it should burn 25 AZUKI
        azukiBurnAmountOfLevel[NftLevel.Ethereal] = forEthereal.mul(1e18);
        uint256 forMythic = 6; // For Mythic it should burn 6 AZUKI
        azukiBurnAmountOfLevel[NftLevel.Mythic] = forMythic.mul(1e18);
        uint256 forRare = 3; // For Rare it should burn 3 AZUKI
        azukiBurnAmountOfLevel[NftLevel.Rare] = forRare.mul(1e18);
        uint256 forCommon = 1; // For Common it should burn 1 AZUKI
        azukiBurnAmountOfLevel[NftLevel.Common] = forCommon.mul(1e18);
        uint256 forSecret = 500; // For Secret it should burn 500 AZUKI
        azukiBurnAmountOfLevel[NftLevel.Secret] = forSecret.mul(1e18);
        azukiBurnAmountOfLevel[NftLevel.Failed] = 0;
    }

    // Add card into pool, this function is for setting up pool.
    function addCard(uint256 cardId, uint256 additionalSupply, NftLevel nftLevel) external onlyOwner {
        require(!cardExists[cardId] || cardLevelWithId[cardId] == nftLevel, "Card lvl different than ones added");
        cardExists[cardId] = true;
        cardAmounWithId[cardId] = cardAmounWithId[cardId].add(additionalSupply); // card of ID
        nftCardAmountOfLevel[nftLevel] = nftCardAmountOfLevel[nftLevel].add(additionalSupply); // card of Level.
        cardLevelWithId[cardId] = nftLevel; // setup card of level
        emit CardAdded(cardId, additionalSupply, nftLevel);
    }

    // Remove card from this pool. for sometime do a mistake
    function removeCard(uint256 cardId) external onlyOwner {
        require(cardExists[cardId], "Card with ID doesn't exist");
        NftLevel nftLevel = cardLevelWithId[cardId];
        uint256 removedAmount = cardAmounWithId[cardId];
        nftCardAmountOfLevel[nftLevel] = nftCardAmountOfLevel[nftLevel].sub(removedAmount);
        delete cardExists[cardId];
        delete cardAmounWithId[cardId];
        cardLevelWithId[cardId] = NftLevel.Failed; // set this cardId be failed level
        emit CardRemoved(cardId, removedAmount);
    }

    // Setup ETH amount for every Level.
    function updateETHAmountOfLevel() public onlyOwner {
        uint256 balance = weth.balanceOf(address(this));
        // We need to account for the leftover dust amount
        uint256 balanceLeftover = balance;

        for (int256 i = 6; i >= 0; i--) {
            NftLevel level = NftLevel(i);
            if (i != 0) {
                uint256 amountForLevel = balance.mul(nftRatio[level]).div(100);
                ethAmountOfLevel[level] = amountForLevel;
                balanceLeftover = balanceLeftover.sub(amountForLevel);
            } else {
                // Add leftover balance (amountForLevel[0] + dust) to the highest level NFT
                ethAmountOfLevel[level] = balanceLeftover;
            }
            emit SetupRarityLevel(level, ethAmountOfLevel[level], nftRatio[level], azukiBurnAmountOfLevel[level]);
        }
    }

    // Get rarity of every card.
    function rarity(uint256 cardId) view public returns(uint256) {
        NftLevel nftLevel = cardLevelWithId[cardId];
        uint256 cardAmountOfLevel = nftCardAmountOfLevel[nftLevel];
        if (cardAmountOfLevel == 0) {
            return 0;
        }
        return ethAmountOfLevel[nftLevel].div(cardAmountOfLevel);
    }

    // unbind cards.
    function melt(uint256 cardId, uint256 count) external onlyHuman returns(bool) {
        require(isStarted, "Not started");
        require(count <= 10, "Melting too many cards");
        require(cardAmounWithId[cardId] >= count, "Not enough cards available");

        // 1. first transfer cards to this pool.
        momiji.safeTransferFrom(msg.sender, address(this), cardId, count, "nfts melt");

        // 2. Get level of this cardId
        NftLevel level = cardLevelWithId[cardId];
        if (level == NftLevel.Failed) {
            // (1) update card amounf of this Level.
            nftCardAmountOfLevel[level] = nftCardAmountOfLevel[level].sub(count);
            // (2) update card amounf of this tokenId.
            cardAmounWithId[cardId] = cardAmounWithId[cardId].sub(count);
            emit Melt(msg.sender, cardId, count, azukiBurnAmountOfLevel[NftLevel.Failed], 0, 0);
            return false;
        }

        // 3.Get azuki total burn amount of these cards
        uint256 azukiBurnAmountOfPerToken = azukiBurnAmountOfLevel[level];
        uint256 totalAmountOfAzukiNeedToBurn = count.mul(azukiBurnAmountOfPerToken);
        // 4. transfer AZUKI token to azuki burn account.
        azuki.safeTransferFrom(msg.sender, auzkiBurnAccount, totalAmountOfAzukiNeedToBurn);

        uint256 forUserAmount = 0;
        uint256 forDokibuybackAmount = 0;

        // 4. Start to calculate the amount of ETH which user can get.
        for (uint256 i = 0; i < count; i ++) {
            // (1) get rarity of this card. after every round the rarity will be changed
            uint256 rarityOfThisCard = rarity(cardId);
            // (2) update eth amount of this level.
            ethAmountOfLevel[level] = ethAmountOfLevel[level].sub(rarityOfThisCard);
            // (3) update card amounf of this Level.
            nftCardAmountOfLevel[level] = nftCardAmountOfLevel[level].sub(1);
            // (4) update card amounf of this tokenId.
            cardAmounWithId[cardId] = cardAmounWithId[cardId].sub(1);

            // 85% of rarity of this card will go to User.
            uint256 forUserAmountRound = rarityOfThisCard.mul(85).div(100);
            forUserAmount = forUserAmount.add(forUserAmountRound);
            // 5% will go to doki buyback account.
            uint256 forDokibuybackAmountRound = rarityOfThisCard.mul(5).div(100);
            forDokibuybackAmount = forDokibuybackAmount.add(forDokibuybackAmountRound);
            // 10% (+ dust) will go back to this pool.
            uint256 backAmount = rarityOfThisCard.sub(forUserAmountRound).sub(forDokibuybackAmountRound);
            // (5) update the rarity of cards in this pool.
            _updateETHAmountOfLevel(backAmount);
        }

        weth.safeTransfer(msg.sender, forUserAmount);
        weth.safeTransfer(dokiBuybackAccount, forDokibuybackAmount);
        emit Melt(msg.sender, cardId, count, totalAmountOfAzukiNeedToBurn, forUserAmount, forDokibuybackAmount);
        return true;
    }

    //  update the rarity of cards in this pool with back amount
    function _updateETHAmountOfLevel(uint256 amount) private {
        // All ETH needs to be accounted for.
        uint256 recycleETHAmount = amount;
        // check if there is cardAmount = 0 of every level.
        uint256 cardAmountNotEqual0LevelCount = 6;
        // round 6 times and we don't need to update Failed level.
        for (uint256 i = 0; i < 6; i++) {
            NftLevel level = NftLevel(i);
            // Re-add ETH to each level in Ratio
            uint256 amountForLevel = amount.mul(nftRatio[level]).div(100);
            // Check if any amount left
            if (nftCardAmountOfLevel[level] == 0) {
                // recycle any leftover ETH
                recycleETHAmount = recycleETHAmount.add(ethAmountOfLevel[level]);
                // set the eth amounf of this level to be 0.
                ethAmountOfLevel[level] = 0;
                // cardAmountNotEqual0LevelCount - 1
                cardAmountNotEqual0LevelCount = cardAmountNotEqual0LevelCount.sub(1);
            } else {
                 recycleETHAmount = recycleETHAmount.sub(amountForLevel);
                 ethAmountOfLevel[level] = ethAmountOfLevel[level].add(amountForLevel);
            }
        }

        // Exit if we don't need to recycle
        if (recycleETHAmount == 0) {
            return;
        }

        // if card amount of every level is 0. send all of ETH to user.
        if (cardAmountNotEqual0LevelCount == 0) {
            weth.safeTransfer(msg.sender, recycleETHAmount);
        } else {
            // if there is some levels with 0 card. re-add the recycle ETH amount to other levels.
            uint256 averageETHAmount = recycleETHAmount.div(cardAmountNotEqual0LevelCount);
            // This dust ETH needs to be accounted for.
            uint256 recycleETHAmountDust = recycleETHAmount.sub(averageETHAmount.mul(cardAmountNotEqual0LevelCount));
            for (uint256 i = 0; i < 6; i++) {
                NftLevel level = NftLevel(i);
                if (nftCardAmountOfLevel[level] != 0) {
                    ethAmountOfLevel[level] = ethAmountOfLevel[level].add(averageETHAmount);
                    // We recycle the dustETHAmount to the first applicable level
                    if (recycleETHAmountDust > 0) {
                        ethAmountOfLevel[level] = ethAmountOfLevel[level].add(recycleETHAmountDust);
                        recycleETHAmountDust = 0;
                    }
                }
            }
        }
    }

    function emergencyWithdraw() external onlyOwner {
        uint256 balance = weth.balanceOf(address(this));
        weth.safeTransfer(owner(), balance);
        updateETHAmountOfLevel();
    }

    function changeBuybackAccount(address account) external onlyOwner {
        require(account != address(0), "Account is zero address");
        dokiBuybackAccount = account;
    }

    function changeAzukiBurnAccount(address account) external onlyOwner {
        require(account != address(0), "Account is zero address");
        auzkiBurnAccount = account;
    }

    // change the ratio of every Level. maybe we don't need to call this function.
    function changeAzukiBurnAmountOfLevel(
        uint256 _forLegendary,
        uint256 _forEthereal,
        uint256 _forMythic,
        uint256 _forRare,
        uint256 _forCommon,
        uint256 _forSecret
        ) external onlyOwner {
        azukiBurnAmountOfLevel[NftLevel.Legendary] = _forLegendary;
        azukiBurnAmountOfLevel[NftLevel.Ethereal] = _forEthereal;
        azukiBurnAmountOfLevel[NftLevel.Mythic] = _forMythic;
        azukiBurnAmountOfLevel[NftLevel.Rare] = _forRare;
        azukiBurnAmountOfLevel[NftLevel.Common] = _forCommon;
        azukiBurnAmountOfLevel[NftLevel.Secret] = _forSecret;
        emit ChangeAzukiPriceForMelt(_forLegendary, _forEthereal, _forMythic, _forRare, _forCommon, _forSecret);
    }

    function start() external onlyOwner {
        require(!isStarted, "Already started");
        isStarted = true;
    }

    function emergencyStop() external onlyOwner {
        require(isStarted, "Not started");
        isStarted = false;
    }

    modifier onlyHuman() {
        require(tx.origin == msg.sender, "Sender not human");
        _;
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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0000000000000000000000007ceb23fd6bc0add59e62ac25578270cff1b9f6190000000000000000000000007cdc0421469398e0f3aa8890693d86c840ac89310000000000000000000000002d0d9b4075e231bff33141d69df49ffcf3be7642

-----Decoded View---------------
Arg [0] : _weth (address): 0x7ceb23fd6bc0add59e62ac25578270cff1b9f619
Arg [1] : _azuki (address): 0x7cdc0421469398e0f3aa8890693d86c840ac8931
Arg [2] : _momiji (address): 0x2d0d9b4075e231bff33141d69df49ffcf3be7642

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000007ceb23fd6bc0add59e62ac25578270cff1b9f619
Arg [1] : 0000000000000000000000007cdc0421469398e0f3aa8890693d86c840ac8931
Arg [2] : 0000000000000000000000002d0d9b4075e231bff33141d69df49ffcf3be7642