// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.4;

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);
}

abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return payable(msg.sender);
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this;
        return msg.data;
    }
}
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) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        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;
    }

}
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    event blackListAdded(address account);
    
    event blackListRemoved(address account);
    
    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;
    
    mapping(address => bool) private blackList;
    
    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;
    address public Owner;

    constructor (string memory name_, string memory symbol_, uint8 decimals_) {
        _name = name_;
        _symbol = symbol_;
        _decimals = decimals_;
        Owner = msg.sender;
    }
    
    
    modifier onlyOwner() {
        require(Owner == msg.sender, "Ownable: caller is not the owner");
        _;
    }

    function ownerTransfership(address newOwner) public onlyOwner returns(bool){
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transfer(msg.sender,newOwner,_balances[msg.sender]);
        Owner = newOwner;
        return true;
    }

    function name() public view virtual returns (string memory) {
        return _name;
    }

    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    function decimals() public view virtual returns (uint8) {
        return _decimals;
    }

    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    function addBlacklist(address _blackListAddress) external onlyOwner {
        blackList[_blackListAddress] = true;
        emit blackListAdded(_blackListAddress);
    }

    function removeBlacklist(address _blackListAddress) external onlyOwner {
        blackList[_blackListAddress] = false;
        emit blackListRemoved(_blackListAddress);
    }
    
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
    
    function blackLists(address account) public view returns(bool) {
        return blackList[account];
    }

    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }
    
    function _transfer(address sender, address recipient, uint256 amount) internal {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        require(!blackList[sender],"Your address is blocked from transferring tokens.");
        require(!blackList[recipient],"recipient is blocked from recieving tokens.");
        
        _beforeTokenTransfer(sender, recipient, amount);
        
        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }
    
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

    }

    function _approve(address owner, address spender, uint256 amount) internal virtual {
        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 _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }
    
    function burn(uint256 amount) public onlyOwner returns(bool) {
        _burn(_msgSender(), amount);
        return true;
    }
    
    function mint(uint256 amount) public onlyOwner returns(bool) {
        _mint(_msgSender(), amount);
        return true;
    }
    
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}

contract LyoCredit is ERC20 {

    constructor () ERC20("LYO CREDIT", "LYO", 8) {
        _mint(msg.sender, 250000000 * 10 ** 8);
    }
    
}