HIGH severity: Exceeds Fees Limit. The contract owner can increase fees above the allowed limit.

Vulnerable code:
/**

 *Submitted for verification at BscScan.com on 2022-12-29

*/



/**

Name        : Crypto Bitaxy

Symbol      : C-Bitaxy



♻️ Contact Verified

📈 Audit is in progress



Social Media

Website    :  https://CryptoBitaxy.com

Facebook :  https://facebook.com/cryptobitaxy

Telegram  :  https://t.me/cryptobitaxy

Twitter 	 :  https://twitter.com/cryptobitaxy

*/



pragma solidity 0.6.12;

// SPDX-License-Identifier: Unlicensed

// XTRA Token 

// TARAPLATFORM.COM



interface IERC20 {



    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);

}



library SafeMath {

    function add(uint256 a, uint256 b) internal pure returns (uint256) {

        uint256 c = a + b;

        require(c >= a, "SafeMath: addition overflow");



        return c;

    }

    

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {

        return sub(a, b, "SafeMath: subtraction overflow");

    }

    

    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {

        require(b <= a, errorMessage);

        uint256 c = a - b;



        return c;

    }

    

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {

        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the

        // benefit is lost if 'b' is also tested.

        if (a == 0) {

            return 0;

        }



        uint256 c = a * b;

        require(c / a == b, "SafeMath: multiplication overflow");



        return c;

    }

    

    function div(uint256 a, uint256 b) internal pure returns (uint256) {

        return div(a, b, "SafeMath: division by zero");

    }

    

    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {

        require(b > 0, errorMessage);

        uint256 c = a / b;

        // assert(a == b * c + a % b); // There is no case in which this doesn't hold



        return c;

    }



    function mod(uint256 a, uint256 b) internal pure returns (uint256) {

        return mod(a, b, "SafeMath: modulo by zero");

    }



    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {

        require(b != 0, errorMessage);

        return a % b;

    }

}



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;

    }

}





/**

 * @dev Collection of functions related to the address type

 */

library Address {



    function isContract(address account) internal view returns (bool) {

        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts

        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned

        // for accounts without code, i.e. `keccak256('')`

        bytes32 codehash;

        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;

        // solhint-disable-next-line no-inline-assembly

        assembly { codehash := extcodehash(account) }

        return (codehash != accountHash && codehash != 0x0);

    }



    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");

    }



    function functionCall(address target, bytes memory data) internal returns (bytes memory) {

      return functionCall(target, data, "Address: low-level call failed");

    }



    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {

        return _functionCallWithValue(target, data, 0, errorMessage);

    }



    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");

    }



    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");

        return _functionCallWithValue(target, data, value, errorMessage);

    }



    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {

        require(isContract(target), "Address: call to non-contract");



        // solhint-disable-next-line avoid-low-level-calls

        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);

        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);

            }

        }

    }

}



contract Ownable is Context {

    address private _owner;

    address private _previousOwner;

    uint256 private _lockTime;



    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 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");

        _;

    }



    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;

    }



    function geUnlockTime() public view returns (uint256) {

        return _lockTime;

    }



    //Locks the contract for owner for the amount of time provided

    function lock(uint256 time) public virtual onlyOwner {

        _previousOwner = _owner;

        _owner = address(0);

        _lockTime = now + time;

        emit OwnershipTransferred(_owner, address(0));

    }

    

    //Unlocks the contract for owner when _lockTime is exceeds

    function unlock() public virtual {

        require(_previousOwner == msg.sender, "You don't have permission to unlock");

        require(now > _lockTime , "Contract is locked until 7 days");

        emit OwnershipTransferred(_owner, _previousOwner);

        _owner = _previousOwner;

    }

}



// pragma solidity >=0.5.0;



interface IUniswapV2Factory {

    event PairCreated(address indexed token0, address indexed token1, address pair, uint);



    function feeTo() external view returns (address);

    function feeToSetter() external view returns (address);



    function getPair(address tokenA, address tokenB) external view returns (address pair);

    function allPairs(uint) external view returns (address pair);

    function allPairsLength() external view returns (uint);



    function createPair(address tokenA, address tokenB) external returns (address pair);



    function setFeeTo(address) external;

    function setFeeToSetter(address) external;

}





// pragma solidity >=0.5.0;



interface IUniswapV2Pair {

    event Approval(address indexed owner, address indexed spender, uint value);

    event Transfer(address indexed from, address indexed to, uint value);



    function name() external pure returns (string memory);

    function symbol() external pure returns (string memory);

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint);

    function balanceOf(address owner) external view returns (uint);

    function allowance(address owner, address spender) external view returns (uint);



    function approve(address spender, uint value) external returns (bool);

    function transfer(address to, uint value) external returns (bool);

    function transferFrom(address from, address to, uint value) external returns (bool);



    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint);



    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;



    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);

    event Swap(

        address indexed sender,

        uint amount0In,

        uint amount1In,

        uint amount0Out,

        uint amount1Out,

        address indexed to

    );

    event Sync(uint112 reserve0, uint112 reserve1);



    function MINIMUM_LIQUIDITY() external pure returns (uint);

    function factory() external view returns (address);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);

    function price0CumulativeLast() external view returns (uint);

    function price1CumulativeLast() external view returns (uint);

    function kLast() external view returns (uint);



    function burn(address to) external returns (uint amount0, uint amount1);

    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;

    function skim(address to) external;

    function sync() external;



    function initialize(address, address) external;

}



// pragma solidity >=0.6.2;



interface IUniswapV2Router01 {

    function factory() external pure returns (address);

    function WETH() external pure returns (address);



    function addLiquidity(

        address tokenA,

        address tokenB,

        uint amountADesired,

        uint amountBDesired,

        uint amountAMin,

        uint amountBMin,

        address to,

        uint deadline

    ) external returns (uint amountA, uint amountB, uint liquidity);

    function addLiquidityETH(

        address token,

        uint amountTokenDesired,

        uint amountTokenMin,

        uint amountETHMin,

        address to,

        uint deadline

    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);

    function removeLiquidity(

        address tokenA,

        address tokenB,

        uint liquidity,

        uint amountAMin,

        uint amountBMin,

        address to,

        uint deadline

    ) external returns (uint amountA, uint amountB);

    function removeLiquidityETH(

        address token,

        uint liquidity,

        uint amountTokenMin,

        uint amountETHMin,

        address to,

        uint deadline

    ) external returns (uint amountToken, uint amountETH);

    function removeLiquidityWithPermit(

        address tokenA,

        address tokenB,

        uint liquidity,

        uint amountAMin,

        uint amountBMin,

        address to,

        uint deadline,

        bool approveMax, uint8 v, bytes32 r, bytes32 s

    ) external returns (uint amountA, uint amountB);

    function removeLiquidityETHWithPermit(

        address token,

        uint liquidity,

        uint amountTokenMin,

        uint amountETHMin,

        address to,

        uint deadline,

        bool approveMax, uint8 v, bytes32 r, bytes32 s

    ) external returns (uint amountToken, uint amountETH);

    function swapExactTokensForTokens(

        uint amountIn,

        uint amountOutMin,

        address[] calldata path,

        address to,

        uint deadline

    ) external returns (uint[] memory amounts);

    function swapTokensForExactTokens(

        uint amountOut,

        uint amountInMax,

        address[] calldata path,

        address to,

        uint deadline

    ) external returns (uint[] memory amounts);

    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)

        external

        payable

        returns (uint[] memory amounts);

    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)

        external

        returns (uint[] memory amounts);

    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)

        external

        returns (uint[] memory amounts);

    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)

        external

        payable

        returns (uint[] memory amounts);



    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);

    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);

    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);

    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);

    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);

}



interface IUniswapV2Router02 is IUniswapV2Router01 {

    function removeLiquidityETHSupportingFeeOnTransferTokens(

        address token,

        uint liquidity,

        uint amountTokenMin,

        uint amountETHMin,

        address to,

        uint deadline

    ) external returns (uint amountETH);

    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(

        address token,

        uint liquidity,

        uint amountTokenMin,

        uint amountETHMin,

        address to,

        uint deadline,

        bool approveMax, uint8 v, bytes32 r, bytes32 s

    ) external returns (uint amountETH);



    function swapExactTokensForTokensSupportingFeeOnTransferTokens(

        uint amountIn,

        uint amountOutMin,

        address[] calldata path,

        address to,

        uint deadline

    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(

        uint amountOutMin,

        address[] calldata path,

        address to,

        uint deadline

    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(

        uint amountIn,

        uint amountOutMin,

        address[] calldata path,

        address to,

        uint deadline

    ) external;

}





contract CryptoBitaxy is Context, IERC20, Ownable {

    

    using SafeMath for uint256;

    using Address for address;



    mapping (address => uint256) private _rOwned;

    mapping (address => uint256) private _tOwned;

    mapping (address => mapping (address => uint256)) private _allowances;



    mapping (address => bool) private _isExcludedFromFee;



    mapping (address => bool) private _isExcluded;

    address[] private _excluded;

   

    uint256 private constant MAX = ~uint256(0);

    uint256 private _tTotal = 250 * 10**6 * 10**9;

    uint256 private _rTotal = (MAX - (MAX % _tTotal));

    uint256 private _tFeeTotal;



    string private _name = "Crypto Bitaxy";

    string private _symbol = "C-BITAXY";

    uint8 private _decimals = 9;

    

    //Reflection reward to holders

    uint256 public _taxFee = 1;

    uint256 private _previousTaxFee = _taxFee;

    

    //Automatic LP

    uint256 public _liquidityFee = 1;

    uint256 private _previousLiquidityFee = _liquidityFee;



    //Automatic Burn

    uint256 public _burnFee = 0;

    uint256 private _previousBurnFee = _burnFee;



    //Charity wallet

    uint256 public _charityFee = 5;

    address public charityWallet = 0xF90Cf441203A5faf4015F36547883f75e7E11092;

    uint256 private _previouscharityFee = _charityFee;



    IUniswapV2Router02 public  uniswapV2Router;

    address public  uniswapV2Pair;

    

    bool inSwapAndLiquify;

    bool public swapAndLiquifyEnabled = true;



    uint256 private numTokensSellToAddToLiquidity = 50 * 10**18;

    

    event MinTokensBeforeSwapUpdated(uint256 minTokensBeforeSwap);

    event SwapAndLiquifyEnabledUpdated(bool enabled);

    event SwapAndLiquify(

        uint256 tokensSwapped,

        uint256 ethReceived,

        uint256 tokensIntoLiqudity

    );

    

    modifier lockTheSwap {

        inSwapAndLiquify = true;

        _;

        inSwapAndLiquify = false;

    }

    

    constructor () public {

        _rOwned[_msgSender()] = _rTotal;

        

        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x10ED43C718714eb63d5aA57B78B54704E256024E);

        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())

            .createPair(address(this), _uniswapV2Router.WETH());



        uniswapV2Router = _uniswapV2Router;

        

        _isExcludedFromFee[owner()] = true;

        _isExcludedFromFee[address(this)] = true;

        

        emit Transfer(address(0), _msgSender(), _tTotal);

    }



    function name() public view returns (string memory) {

        return _name;

    }



    function symbol() public view returns (string memory) {

        return _symbol;

    }



    function decimals() public view returns (uint8) {

        return _decimals;

    }



    function totalSupply() public view override returns (uint256) {

        return _tTotal;

    }



    function balanceOf(address account) public view override returns (uint256) {

        if (_isExcluded[account]) return _tOwned[account];

        return tokenFromReflection(_rOwned[account]);

    }



    function transfer(address recipient, uint256 amount) public override returns (bool) {

        _transfer(_msgSender(), recipient, amount);

        return true;

    }



    function allowance(address owner, address spender) public view override returns (uint256) {

        return _allowances[owner][spender];

    }



    function approve(address spender, uint256 amount) public override returns (bool) {

        _approve(_msgSender(), spender, amount);

        return true;

    }



    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {

        _transfer(sender, recipient, amount);

        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));

        return true;

    }



    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {

        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));

        return true;

    }



    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {

        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));

        return true;

    }



    function isExcludedFromReward(address account) public view returns (bool) {

        return _isExcluded[account];

    }



    function totalFees() public view returns (uint256) {

        return _tFeeTotal;

    }



    function deliver(uint256 tAmount) public {

        address sender = _msgSender();

        require(!_isExcluded[sender], "Excluded addresses cannot call this function");

        (uint256 rAmount,,,,,) = _getValues(tAmount);

        _rOwned[sender] = _rOwned[sender].sub(rAmount);

        _rTotal = _rTotal.sub(rAmount);

        _tFeeTotal = _tFeeTotal.add(tAmount);

    }



    function reflectionFromToken(uint256 tAmount, bool deductTransferFee) public view returns(uint256) {

        require(tAmount <= _tTotal, "Amount must be less than supply");

        if (!deductTransferFee) {

            (uint256 rAmount,,,,,) = _getValues(tAmount);

            return rAmount;

        } else {

            (,uint256 rTransferAmount,,,,) = _getValues(tAmount);

            return rTransferAmount;

        }

    }



    function tokenFromReflection(uint256 rAmount) public view returns(uint256) {

        require(rAmount <= _rTotal, "Amount must be less than total reflections");

        uint256 currentRate =  _getRate();

        return rAmount.div(currentRate);

    }



    function excludeFromReward(address account) public onlyOwner() {

        // require(account != 0x05fF2B0DB69458A0750badebc4f9e13aDd608C7F, 'We can not exclude Pancake router.');

        require(!_isExcluded[account], "Account is already excluded");

        if(_rOwned[account] > 0) {

            _tOwned[account] = tokenFromReflection(_rOwned[account]);

        }

        _isExcluded[account] = true;

        _excluded.push(account);

    }



    function includeInReward(address account) external onlyOwner() {

        require(_isExcluded[account], "Account is already excluded");

        for (uint256 i = 0; i < _excluded.length; i++) {

            if (_excluded[i] == account) {

                _excluded[i] = _excluded[_excluded.length - 1];

                _tOwned[account] = 0;

                _isExcluded[account] = false;

                _excluded.pop();

                break;

            }

        }

    }



    function _transferBothExcluded(address sender, address recipient, uint256 tAmount) private {

        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity) = _getValues(tAmount);

        _tOwned[sender] = _tOwned[sender].sub(tAmount);

        _rOwned[sender] = _rOwned[sender].sub(rAmount);

        _tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);

        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);        

        _takeLiquidity(tLiquidity);

        _reflectFee(rFee, tFee);

        emit Transfer(sender, recipient, tTransferAmount);

    }

    

    receive() external payable {}



    function _reflectFee(uint256 rFee, uint256 tFee) private {

        _rTotal = _rTotal.sub(rFee);

        _tFeeTotal = _tFeeTotal.add(tFee);

    }



    function _getValues(uint256 tAmount) private view returns (uint256, uint256, uint256, uint256, uint256, uint256) {

        (uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity) = _getTValues(tAmount);

        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee) = _getRValues(tAmount, tFee, tLiquidity, _getRate());

        return (rAmount, rTransferAmount, rFee, tTransferAmount, tFee, tLiquidity);

    }



    function _getTValues(uint256 tAmount) private view returns (uint256, uint256, uint256) {

        uint256 tFee = calculateTaxFee(tAmount);

        uint256 tLiquidity = calculateLiquidityFee(tAmount);

        uint256 tTransferAmount = tAmount.sub(tFee).sub(tLiquidity);

        return (tTransferAmount, tFee, tLiquidity);

    }



    function _getRValues(uint256 tAmount, uint256 tFee, uint256 tLiquidity, uint256 currentRate) private pure returns (uint256, uint256, uint256) {

        uint256 rAmount = tAmount.mul(currentRate);

        uint256 rFee = tFee.mul(currentRate);

        uint256 rLiquidity = tLiquidity.mul(currentRate);

        uint256 rTransferAmount = rAmount.sub(rFee).sub(rLiquidity);

        return (rAmount, rTransferAmount, rFee);

    }



    function _getRate() private view returns(uint256) {

        (uint256 rSupply, uint256 tSupply) = _getCurrentSupply();

        return rSupply.div(tSupply);

    }



    function _getCurrentSupply() private view returns(uint256, uint256) {

        uint256 rSupply = _rTotal;

        uint256 tSupply = _tTotal;      

        for (uint256 i = 0; i < _excluded.length; i++) {

            if (_rOwned[_excluded[i]] > rSupply || _tOwned[_excluded[i]] > tSupply) return (_rTotal, _tTotal);

            rSupply = rSupply.sub(_rOwned[_excluded[i]]);

            tSupply = tSupply.sub(_tOwned[_excluded[i]]);

        }

        if (rSupply < _rTotal.div(_tTotal)) return (_rTotal, _tTotal);

        return (rSupply, tSupply);

    }

    

    function _takeLiquidity(uint256 tLiquidity) private {

        uint256 currentRate =  _getRate();

        uint256 rLiquidity = tLiquidity.mul(currentRate);

        _rOwned[address(this)] = _rOwned[address(this)].add(rLiquidity);

        if(_isExcluded[address(this)])

            _tOwned[address(this)] = _tOwned[address(this)].add(tLiquidity);

    }

    

    function calculateTaxFee(uint256 _amount) private view returns (uint256) {

        return _amount.mul(_taxFee).div(

            10**2

        );

    }



    function calculateLiquidityFee(uint256 _amount) private view returns (uint256) {

        return _amount.mul(_liquidityFee).div(

            10**2

        );

    }

    

    function removeAllFee() private {

        if(_taxFee == 0 && _liquidityFee == 0 && _charityFee==0 && _burnFee==0) return;

        

        _previousTaxFee = _taxFee;

        _previousLiquidityFee = _liquidityFee;

        _previousBurnFee = _burnFee;

        _previouscharityFee = _charityFee;

        

        _taxFee = 0;

        _liquidityFee = 0;

        _charityFee = 0;

        _burnFee = 0;

    }

    

    function restoreAllFee() private {

       _taxFee = _previousTaxFee;

       _liquidityFee = _previousLiquidityFee;

       _burnFee = _previousBurnFee;

       _charityFee = _previouscharityFee;

    }

    

    function isExcludedFromFee(address account) public view returns(bool) {

        return _isExcludedFromFee[account];

    }



    function _approve(address owner, address spender, uint256 amount) private {

        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 _transfer(

        address from,

        address to,

        uint256 amount

    ) private {

        require(from != address(0), "ERC20: transfer from the zero address");

        require(amount > 0, "Transfer amount must be greater than zero");



        // is the token balance of this contract address over the min number of

        // tokens that we need to initiate a swap + liquidity lock?

        // also, don't get caught in a circular liquidity event.

        // also, don't swap & liquify if sender is uniswap pair.

        uint256 contractTokenBalance = balanceOf(address(this));        

        bool overMinTokenBalance = contractTokenBalance >= numTokensSellToAddToLiquidity;

        if (

            overMinTokenBalance &&

            !inSwapAndLiquify &&

            from != uniswapV2Pair &&

            swapAndLiquifyEnabled

        ) {

            contractTokenBalance = numTokensSellToAddToLiquidity;

            //add liquidity

            swapAndLiquify(contractTokenBalance);

        }

        

        //transfer amount, it will take tax, burn, liquidity fee

        _tokenTransfer(from,to,amount);

    }



    function swapAndLiquify(uint256 contractTokenBalance) private lockTheSwap {

        // split the contract balance into halves

        uint256 half = contractTokenBalance.div(2);

        uint256 otherHalf = contractTokenBalance.sub(half);



        // capture the contract's current ETH balance.

        // this is so that we can capture exactly the amount of ETH that the

        // swap creates, and not make the liquidity event include any ETH that

        // has been manually sent to the contract

        uint256 initialBalance = address(this).balance;



        // swap tokens for ETH

        swapTokensForEth(half); // <- this breaks the ETH -> HATE swap when swap+liquify is triggered



        // how much ETH did we just swap into?

        uint256 newBalance = address(this).balance.sub(initialBalance);



        // add liquidity to uniswap

        addLiquidity(otherHalf, newBalance);

        

        emit SwapAndLiquify(half, newBalance, otherHalf);

    }



    function swapTokensForEth(uint256 tokenAmount) private {

        // generate the uniswap pair path of token -> weth

        address[] memory path = new address[](2);

        path[0] = address(this);

        path[1] = uniswapV2Router.WETH();



        _approve(address(this), address(uniswapV2Router), tokenAmount);



        // make the swap

        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(

            tokenAmount,

            0, // accept any amount of ETH

            path,

            address(this),

            block.timestamp

        );

    }



    function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {

        // approve token transfer to cover all possible scenarios

        _approve(address(this), address(uniswapV2Router), tokenAmount);



        // add the liquidity

        uniswapV2Router.addLiquidityETH{value: ethAmount}(

            address(this),

            tokenAmount,

            0, // slippage is unavoidable

            0, // slippage is unavoidable

            owner(),

            block.timestamp

        );

    }



    //this method is responsible for taking all fee, if takeFee is true

    function _tokenTransfer(address sender, address recipient, uint256 amount) private {

        if(_isExcludedFromFee[sender] || _isExcludedFromFee[recipient]){

            removeAllFee();

        }

        

        //Calculate burn amount and charity amount

        uint256 burnAmt = amount.mul(_burnFee).div(100);

        uint256 charityAmt = amount.mul(_charityFee).div(100);



        if (_isExcluded[sender] && !_isExcluded[recipient]) {

            _transferFromExcluded(sender, recipient, (amount.sub(burnAmt).sub(charityAmt)));

        } else if (!_isExcluded[sender] && _isExcluded[recipient]) {

            _transferToExcluded(sender, recipient, (amount.sub(burnAmt).sub(charityAmt)));

        } else if (!_isExcluded[sender] && !_isExcluded[recipient]) {

            _transferStandard(sender, recipient, (amount.sub(burnAmt).sub(charityAmt)));

        } else if (_isExcluded[sender] && _isExcluded[recipient]) {

            _transferBothExcluded(sender, recipient, (amount.sub(burnAmt).sub(charityAmt)));

        } else {

            _transferStandard(sender, recipient, (amount.sub(burnAmt).sub(charityAmt)));

        }

        

        //Temporarily remove fees to transfer to burn address and charity wallet

        _taxFee = 0;

        _liquidityFee = 0;





        _transferStandard(sender, address(0), burnAmt);

        _transferStandard(sender, charityWallet, charityAmt);



        //Restore tax and liquidity fees

        _taxFee = _previousTaxFee;

        _liquidityFee = _previousLiquidityFee;





        if(_isExcludedFromFee[sender] || _isExcludedFromFee[recipient])

            restoreAllFee();

    }



    function _transferStandard(address sender, address recipient, uint256 tAmount) private {

        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity) = _getValues(tAmount);

        _rOwned[sender] = _rOwned[sender].sub(rAmount);

        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);

        _takeLiquidity(tLiquidity);

        _reflectFee(rFee, tFee);

        emit Transfer(sender, recipient, tTransferAmount);

    }



    function _transferToExcluded(address sender, address recipient, uint256 tAmount) private {

        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity) = _getValues(tAmount);

        _rOwned[sender] = _rOwned[sender].sub(rAmount);

        _tOwned[recipient] = _tOwned[recipient].add(tTransferAmount);

        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);           

        _takeLiquidity(tLiquidity);

        _reflectFee(rFee, tFee);

        emit Transfer(sender, recipient, tTransferAmount);

    }



    function _transferFromExcluded(address sender, address recipient, uint256 tAmount) private {

        (uint256 rAmount, uint256 rTransferAmount, uint256 rFee, uint256 tTransferAmount, uint256 tFee, uint256 tLiquidity) = _getValues(tAmount);

        _tOwned[sender] = _tOwned[sender].sub(tAmount);

        _rOwned[sender] = _rOwned[sender].sub(rAmount);

        _rOwned[recipient] = _rOwned[recipient].add(rTransferAmount);   

        _takeLiquidity(tLiquidity);

        _reflectFee(rFee, tFee);

        emit Transfer(sender, recipient, tTransferAmount);

    }



    function excludeFromFee(address account) public onlyOwner {

        _isExcludedFromFee[account] = true;

    }

    

    function includeInFee(address account) public onlyOwner {

        _isExcludedFromFee[account] = false;

    }

    

    function setcharityWallet(address newWallet) external onlyOwner() {

        charityWallet = newWallet;

    }

    

    function setTaxFeePercent(uint256 taxFee) external onlyOwner() {

        _taxFee = taxFee;

    }

    

    function setLiquidityFeePercent(uint256 liquidityFee) external onlyOwner() {

        _liquidityFee = liquidityFee;

    }

    

    function setChartityFeePercent(uint256 charityFee) external onlyOwner() {

        _charityFee = charityFee;

    }

    

    function setBurnFeePercent(uint256 burnFee) external onlyOwner() {

        _burnFee = burnFee;

    }



    function setRouterAddress(address newRouter) public onlyOwner() {

        IUniswapV2Router02 _newPancakeRouter = IUniswapV2Router02(newRouter);

        uniswapV2Pair = IUniswapV2Factory(_newPancakeRouter.factory()).createPair(address(this), _newPancakeRouter.WETH());

        uniswapV2Router = _newPancakeRouter;

    }

    

    function setSwapAndLiquifyEnabled(bool _enabled) public onlyOwner {

        swapAndLiquifyEnabled = _enabled;

        emit SwapAndLiquifyEnabledUpdated(_enabled);

    }

    

}

Vulnerability type: CWE-284|CWE-285|CWE-863