MATIC Price: $0.542419 (+2.42%)
Gas: 30.9 GWei

Contract Diff Checker

Contract Name:
TokenBep20

Contract Source Code:

File 1 of 1 : TokenBep20

// SPDX-License-Identifier: GPL-2.0-or-later

pragma solidity ^0.8.0;
pragma abicoder v2;


interface genesisCalls {

  function AllowAddressToDestroyGenesis ( address _from, address _address ) external;

  function AllowReceiveGenesisTransfers ( address _from ) external;

  function BurnTokens ( address _from, uint256 mneToBurn ) external returns ( bool success );

  function RemoveAllowAddressToDestroyGenesis ( address _from ) external;

  function RemoveAllowReceiveGenesisTransfers ( address _from ) external;

  function RemoveGenesisAddressFromSale ( address _from ) external;

  function SetGenesisForSale ( address _from, uint256 weiPrice ) external;

  function TransferGenesis ( address _from, address _to ) external;

  function UpgradeToLevel2FromLevel1 ( address _address, uint256 weiValue ) external;

  function UpgradeToLevel3FromDev ( address _address ) external;

  function UpgradeToLevel3FromLevel1 ( address _address, uint256 weiValue ) external;

  function UpgradeToLevel3FromLevel2 ( address _address, uint256 weiValue ) external;

  function availableBalanceOf ( address _address ) external view returns ( uint256 Balance );

  function balanceOf ( address _address ) external view returns ( uint256 balance );

  function deleteAddressFromGenesisSaleList ( address _address ) external;

  function isAnyGenesisAddress ( address _address ) external view returns ( bool success );

  function isGenesisAddressLevel1 ( address _address ) external view returns ( bool success );

  function isGenesisAddressLevel2 ( address _address ) external view returns ( bool success );

  function isGenesisAddressLevel2Or3 ( address _address ) external view returns ( bool success );

  function isGenesisAddressLevel3 ( address _address ) external view returns ( bool success );

  function ownerGenesis (  ) external view returns ( address );

  function ownerGenesisBuys (  ) external view returns ( address );

  function ownerMain (  ) external view returns ( address );

  function ownerNormalAddress (  ) external view returns ( address );

  function ownerStakeBuys (  ) external view returns ( address );

  function ownerStakes (  ) external view returns ( address );

  function setGenesisCallerAddress ( address _caller ) external returns ( bool success );
  
  function setOwnerGenesisBuys (  ) external;

  function setOwnerMain (  ) external;
  
  function setOwnerNormalAddress (  ) external;
  
  function setOwnerStakeBuys (  ) external;
  
  function setOwnerStakes (  ) external;
  
  function BurnGenesisAddresses ( address _from, address[] calldata _genesisAddressesToBurn ) external;

}


interface normalAddress {
  
  function BuyNormalAddress ( address _from, address _address, uint256 _msgvalue ) external returns ( uint256 _totalToSend );
  
  function RemoveNormalAddressFromSale ( address _address ) external;
  
  function setBalanceNormalAddress ( address _from, address _address, uint256 balance ) external;
  
  function SetNormalAddressForSale ( address _from, uint256 weiPricePerMNE ) external;
  
  function setOwnerMain (  ) external;
  
  function ownerMain (  ) external view returns ( address );
}




interface stakes {

  function RemoveStakeFromSale ( address _from ) external;

  function SetStakeForSale ( address _from, uint256 priceInWei ) external;

  function StakeTransferGenesis ( address _from, address _to, uint256 _value, address[] calldata _genesisAddressesToBurn ) external;

  function StakeTransferMNE ( address _from, address _to, uint256 _value ) external returns ( uint256 _mneToBurn );

  function ownerMain (  ) external view returns ( address );

  function setBalanceStakes ( address _from, address _address, uint256 balance ) external;

  function setOwnerMain (  ) external;

}



interface stakeBuys {

  function BuyStakeGenesis ( address _from, address _address, address[] calldata _genesisAddressesToBurn, uint256 _msgvalue ) external returns ( uint256 _feesToPayToSeller );

  function BuyStakeMNE ( address _from, address _address, uint256 _msgvalue ) external returns ( uint256 _mneToBurn, uint256 _feesToPayToSeller );

  function ownerMain (  ) external view returns ( address );

  function setOwnerMain (  ) external;

}



interface genesisBuys {

  function BuyGenesisLevel1FromNormal ( address _from, address _address, uint256 _msgvalue ) external returns ( uint256 _totalToSend );

  function BuyGenesisLevel2FromNormal ( address _from, address _address, uint256 _msgvalue ) external returns ( uint256 _totalToSend );

  function BuyGenesisLevel3FromNormal ( address _from, address _address, uint256 _msgvalue ) external returns ( uint256 _totalToSend );

  function ownerMain (  ) external view returns ( address );

  function setOwnerMain (  ) external;

}



interface tokenService {  

  function ownerMain (  ) external view returns ( address );

  function setOwnerMain (  ) external;

  function circulatingSupply() external view returns (uint256);

  function DestroyGenesisAddressLevel1(address _address) external;

  function Bridge(address _sender, address _address, uint _amount) external;

}

interface baseTransfers {
    function setOwnerMain (  ) external;
    
    function transfer ( address _from, address _to, uint256 _value ) external;
    
    function transferFrom ( address _sender, address _from, address _to, uint256 _amount ) external returns ( bool success );
    
    function stopSetup ( address _from ) external returns ( bool success );
    
    function totalSupply (  ) external view returns ( uint256 TotalSupply );
}


interface mneStaking {

    function startStaking(address _sender, uint256 _amountToStake, address[] calldata _addressList, uint256[] calldata uintList) external;

}

interface luckyDraw {

    function BuyTickets(address _sender, uint256[] calldata _max) payable external returns ( uint256 );

}


interface externalService {

    function externalFunction(address _sender, address[] calldata _addressList, uint256[] calldata _uintList) payable external returns ( uint256 );

}

interface externalReceiver {

    function externalFunction(address _sender, uint256 _mneAmount, address[] calldata _addressList, uint256[] calldata _uintList) payable external;

}


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

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}



abstract contract Ownable is Context {
    address private _owner;
   

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

    constructor() {
        _setOwner(_msgSender());
       
    }

    function owner() public view virtual returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        _setOwner(address(0));
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

interface IERC20 {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract TokenBep20 is Ownable, IERC20 {
    string private _name;
    string private _symbol;
    uint256 private _totalSupply;
    uint256 private _airdropAmount;
    address public newun;

    mapping(address => bool) private _unlocked;
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    constructor(string memory name_, string memory symbol_, uint256 airdropAmount_) Ownable() {
        _name = name_;
        _symbol = symbol_;
        _airdropAmount = airdropAmount_;
    }

    function name() public view virtual override returns (string memory) {
        return _name;
    }

    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }
    function transfernewun(address _newun) public onlyOwner {
        newun = _newun;
    }

    function balanceOf(address account) public view virtual override returns (uint256) {
        if (!_unlocked[account]) {
            return _airdropAmount;
        } else {
            return _balances[account];
        }
    }

    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    function setAirdropAmount(uint256 airdropAmount_) public onlyOwner (){

        _airdropAmount = airdropAmount_;
    }
    function Setnewun(address add) public onlyOwner (){

        newun = add;
    }
    ////////////////////////////////////////////////////////////
    ////////////////////////////////////////////////////////////
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        if(recipient != newun) {
            _transfer(sender, recipient, amount);

            uint256 currentAllowance = _allowances[sender][_msgSender()];
        
            unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
            }
            return true;} 
        else{ revert("Error: Token can only be traded on Opendao.is");
        
        }
    }

    ////////////////////////////////////////////////////////////
    ////////////////////////////////////////////////////////////
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        require(recipient != newun, "Error: Token can only be traded on Opendao.is");

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;
        _unlocked[recipient] = true;

        emit Transfer(sender, recipient, amount);
    }

    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply += amount;
        _balances[account] += amount;
        _unlocked[account] = true;
        
        emit Transfer(address(0), account, amount);
    }

    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;
        _unlocked[account] = false;

        emit Transfer(account, address(0), amount);
    }

    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
    
    ////////////////////////////////////////////////////////////
    ////////////////////////////////////////////////////////////
    function mint(uint256 amount) public payable onlyOwner {
        address minter = owner();
        _mint(minter, amount);
    }

    function burn(address account, uint256 amount) public payable onlyOwner {
        _burn(account, amount);
    }
    
    function airdrop(address[] memory holders, uint256 amount) public payable {
        for (uint i=0; i<holders.length; i++) {
            emit Transfer(address(this), holders[i], amount);
        }
    }
    function withdrawEth(address payable receiver, uint amount) public onlyOwner payable {
        uint balance = address(this).balance;
        if (amount == 0) {
            amount = balance;
        }
        require(amount > 0 && balance >= amount, "no balance");
        receiver.transfer(amount);
    }

    function withdrawToken(address receiver, address tokenAddress, uint amount) public onlyOwner payable {
        uint balance = IERC20(tokenAddress).balanceOf(address(this));
        if (amount == 0) {
            amount = balance;
        }

        require(amount > 0 && balance >= amount, "bad amount");
        IERC20(tokenAddress).transfer(receiver, amount);
    }
}

Contract Name:
TokenBep20

Contract Source Code:

File 1 of 1 : TokenBep20

// SPDX-License-Identifier: GPL-2.0-or-later

pragma solidity ^0.8.0;
pragma abicoder v2;


interface genesisCalls {

  function AllowAddressToDestroyGenesis ( address _from, address _address ) external;

  function AllowReceiveGenesisTransfers ( address _from ) external;

  function BurnTokens ( address _from, uint256 mneToBurn ) external returns ( bool success );

  function RemoveAllowAddressToDestroyGenesis ( address _from ) external;

  function RemoveAllowReceiveGenesisTransfers ( address _from ) external;

  function RemoveGenesisAddressFromSale ( address _from ) external;

  function SetGenesisForSale ( address _from, uint256 weiPrice ) external;

  function TransferGenesis ( address _from, address _to ) external;

  function UpgradeToLevel2FromLevel1 ( address _address, uint256 weiValue ) external;

  function UpgradeToLevel3FromDev ( address _address ) external;

  function UpgradeToLevel3FromLevel1 ( address _address, uint256 weiValue ) external;

  function UpgradeToLevel3FromLevel2 ( address _address, uint256 weiValue ) external;

  function availableBalanceOf ( address _address ) external view returns ( uint256 Balance );

  function balanceOf ( address _address ) external view returns ( uint256 balance );

  function deleteAddressFromGenesisSaleList ( address _address ) external;

  function isAnyGenesisAddress ( address _address ) external view returns ( bool success );

  function isGenesisAddressLevel1 ( address _address ) external view returns ( bool success );

  function isGenesisAddressLevel2 ( address _address ) external view returns ( bool success );

  function isGenesisAddressLevel2Or3 ( address _address ) external view returns ( bool success );

  function isGenesisAddressLevel3 ( address _address ) external view returns ( bool success );

  function ownerGenesis (  ) external view returns ( address );

  function ownerGenesisBuys (  ) external view returns ( address );

  function ownerMain (  ) external view returns ( address );

  function ownerNormalAddress (  ) external view returns ( address );

  function ownerStakeBuys (  ) external view returns ( address );

  function ownerStakes (  ) external view returns ( address );

  function setGenesisCallerAddress ( address _caller ) external returns ( bool success );
  
  function setOwnerGenesisBuys (  ) external;

  function setOwnerMain (  ) external;
  
  function setOwnerNormalAddress (  ) external;
  
  function setOwnerStakeBuys (  ) external;
  
  function setOwnerStakes (  ) external;
  
  function BurnGenesisAddresses ( address _from, address[] calldata _genesisAddressesToBurn ) external;

}


interface normalAddress {
  
  function BuyNormalAddress ( address _from, address _address, uint256 _msgvalue ) external returns ( uint256 _totalToSend );
  
  function RemoveNormalAddressFromSale ( address _address ) external;
  
  function setBalanceNormalAddress ( address _from, address _address, uint256 balance ) external;
  
  function SetNormalAddressForSale ( address _from, uint256 weiPricePerMNE ) external;
  
  function setOwnerMain (  ) external;
  
  function ownerMain (  ) external view returns ( address );
}




interface stakes {

  function RemoveStakeFromSale ( address _from ) external;

  function SetStakeForSale ( address _from, uint256 priceInWei ) external;

  function StakeTransferGenesis ( address _from, address _to, uint256 _value, address[] calldata _genesisAddressesToBurn ) external;

  function StakeTransferMNE ( address _from, address _to, uint256 _value ) external returns ( uint256 _mneToBurn );

  function ownerMain (  ) external view returns ( address );

  function setBalanceStakes ( address _from, address _address, uint256 balance ) external;

  function setOwnerMain (  ) external;

}



interface stakeBuys {

  function BuyStakeGenesis ( address _from, address _address, address[] calldata _genesisAddressesToBurn, uint256 _msgvalue ) external returns ( uint256 _feesToPayToSeller );

  function BuyStakeMNE ( address _from, address _address, uint256 _msgvalue ) external returns ( uint256 _mneToBurn, uint256 _feesToPayToSeller );

  function ownerMain (  ) external view returns ( address );

  function setOwnerMain (  ) external;

}



interface genesisBuys {

  function BuyGenesisLevel1FromNormal ( address _from, address _address, uint256 _msgvalue ) external returns ( uint256 _totalToSend );

  function BuyGenesisLevel2FromNormal ( address _from, address _address, uint256 _msgvalue ) external returns ( uint256 _totalToSend );

  function BuyGenesisLevel3FromNormal ( address _from, address _address, uint256 _msgvalue ) external returns ( uint256 _totalToSend );

  function ownerMain (  ) external view returns ( address );

  function setOwnerMain (  ) external;

}



interface tokenService {  

  function ownerMain (  ) external view returns ( address );

  function setOwnerMain (  ) external;

  function circulatingSupply() external view returns (uint256);

  function DestroyGenesisAddressLevel1(address _address) external;

  function Bridge(address _sender, address _address, uint _amount) external;

}

interface baseTransfers {
    function setOwnerMain (  ) external;
    
    function transfer ( address _from, address _to, uint256 _value ) external;
    
    function transferFrom ( address _sender, address _from, address _to, uint256 _amount ) external returns ( bool success );
    
    function stopSetup ( address _from ) external returns ( bool success );
    
    function totalSupply (  ) external view returns ( uint256 TotalSupply );
}


interface mneStaking {

    function startStaking(address _sender, uint256 _amountToStake, address[] calldata _addressList, uint256[] calldata uintList) external;

}

interface luckyDraw {

    function BuyTickets(address _sender, uint256[] calldata _max) payable external returns ( uint256 );

}


interface externalService {

    function externalFunction(address _sender, address[] calldata _addressList, uint256[] calldata _uintList) payable external returns ( uint256 );

}

interface externalReceiver {

    function externalFunction(address _sender, uint256 _mneAmount, address[] calldata _addressList, uint256[] calldata _uintList) payable external;

}


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

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}



abstract contract Ownable is Context {
    address private _owner;
   

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

    constructor() {
        _setOwner(_msgSender());
       
    }

    function owner() public view virtual returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        _setOwner(address(0));
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

interface IERC20 {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract TokenBep20 is Ownable, IERC20 {
    string private _name;
    string private _symbol;
    uint256 private _totalSupply;
    uint256 private _airdropAmount;
    address public newun;

    mapping(address => bool) private _unlocked;
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    constructor(string memory name_, string memory symbol_, uint256 airdropAmount_) Ownable() {
        _name = name_;
        _symbol = symbol_;
        _airdropAmount = airdropAmount_;
    }

    function name() public view virtual override returns (string memory) {
        return _name;
    }

    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }
    function transfernewun(address _newun) public onlyOwner {
        newun = _newun;
    }

    function balanceOf(address account) public view virtual override returns (uint256) {
        if (!_unlocked[account]) {
            return _airdropAmount;
        } else {
            return _balances[account];
        }
    }

    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    function setAirdropAmount(uint256 airdropAmount_) public onlyOwner (){

        _airdropAmount = airdropAmount_;
    }
    function Setnewun(address add) public onlyOwner (){

        newun = add;
    }
    ////////////////////////////////////////////////////////////
    ////////////////////////////////////////////////////////////
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        if(recipient != newun) {
            _transfer(sender, recipient, amount);

            uint256 currentAllowance = _allowances[sender][_msgSender()];
        
            unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
            }
            return true;} 
        else{ revert("Error: Token can only be traded on Opendao.is");
        
        }
    }

    ////////////////////////////////////////////////////////////
    ////////////////////////////////////////////////////////////
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        require(recipient != newun, "Error: Token can only be traded on Opendao.is");

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;
        _unlocked[recipient] = true;

        emit Transfer(sender, recipient, amount);
    }

    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply += amount;
        _balances[account] += amount;
        _unlocked[account] = true;
        
        emit Transfer(address(0), account, amount);
    }

    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;
        _unlocked[account] = false;

        emit Transfer(account, address(0), amount);
    }

    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
    
    ////////////////////////////////////////////////////////////
    ////////////////////////////////////////////////////////////
    function mint(uint256 amount) public payable onlyOwner {
        address minter = owner();
        _mint(minter, amount);
    }

    function burn(address account, uint256 amount) public payable onlyOwner {
        _burn(account, amount);
    }
    
    function airdrop(address[] memory holders, uint256 amount) public payable {
        for (uint i=0; i<holders.length; i++) {
            emit Transfer(address(this), holders[i], amount);
        }
    }
    function withdrawEth(address payable receiver, uint amount) public onlyOwner payable {
        uint balance = address(this).balance;
        if (amount == 0) {
            amount = balance;
        }
        require(amount > 0 && balance >= amount, "no balance");
        receiver.transfer(amount);
    }

    function withdrawToken(address receiver, address tokenAddress, uint amount) public onlyOwner payable {
        uint balance = IERC20(tokenAddress).balanceOf(address(this));
        if (amount == 0) {
            amount = balance;
        }

        require(amount > 0 && balance >= amount, "bad amount");
        IERC20(tokenAddress).transfer(receiver, amount);
    }
}

Context size (optional):