Contract Source Code:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract CoDoge {
    string public constant name = "CoDoge";
    string public constant symbol = "CODOGE";
    uint8 public constant decimals = 16;
    uint256 public constant totalSupply = 500000000 * 10**uint256(decimals);
    address public contractOwner;

    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;

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

    modifier onlyOwner() {
        require(msg.sender == contractOwner, "Only contract owner can call this function");
        _;
    }

    constructor() {
        contractOwner = msg.sender;
        balanceOf[msg.sender] = totalSupply;
        emit Transfer(address(0), msg.sender, totalSupply);
    }

    function _transfer(
        address _from,
        address _to,
        uint256 _value
    ) internal {
        require(_to != address(0), "ERC20: transfer to the zero address");
        require(balanceOf[_from] >= _value, "ERC20: transfer amount exceeds balance");
    
        balanceOf[_from] -= _value;
        balanceOf[_to] += _value;
        emit Transfer(_from, _to, _value);
    }

    function transfer(address _to, uint256 _value) public returns (bool success) {
        _transfer(msg.sender, _to, _value);
        return true;
    }

    function transferFrom(
        address _from,
        address _to,
        uint256 _value
    ) public returns (bool success) {
        require(_value <= allowance[_from][msg.sender], "ERC20: transfer amount exceeds allowance");
        allowance[_from][msg.sender] -= _value;
        _transfer(_from, _to, _value);
        return true;
    }

    function approve(address _spender, uint256 _value) public returns (bool success) {
        allowance[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0), "New owner cannot be zero address");
        contractOwner = newOwner;
    }
}