tokenTradex_Token_BY

/**
 * created by tradex.by
*/

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0 <0.9.0;



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

    function _msgData() internal view virtual returns (bytes calldata) {
        this; 
        return msg.data;
    }
}


abstract 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 virtual returns (address) {
        return _owner;
    }

        modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

        function _transferOwnership(address newOwner) internal virtual onlyOwner {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }

}


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
    );
}


interface IERC20Metadata is IERC20 {
        function name() external view returns (string memory);

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

        function decimals() external view returns (uint8);
}


contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

        constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

        function name() public view virtual override returns (string memory) {
        return _name;
    }

        function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

        function decimals() public view virtual override returns (uint8) {
        return 18;
    }

        function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

        function balanceOf(address account)
        public
        view
        virtual
        override
        returns (uint256)
    {
        return _balances[account];
    }

        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 transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(
            currentAllowance >= amount,
            "ERC20: transfer amount exceeds allowance"
        );
        _approve(sender, _msgSender(), currentAllowance - amount);

        return true;
    }

        function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(
            senderBalance >= amount,
            "ERC20: transfer amount exceeds balance"
        );
        _balances[sender] = senderBalance - amount;
        _balances[recipient] += 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 += amount;
        _balances[account] += 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");
        _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 _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}


contract tokenTradex_Token_BY is Ownable, ERC20 {
    uint8 private _decimals;
    string private _additional;

        constructor(
        string memory name,
        string memory symbol,
        uint8 decimalsToken,
        uint256 maximumSupply,
        string memory additional
    ) ERC20(name, symbol) {
        _additional = additional;
        _decimals = decimalsToken;
        _mint(_msgSender(), maximumSupply);
    }

        function fields() public view virtual returns (string memory) {
        return _additional;
    }

    
    
    
        function decimals() public view virtual override returns (uint8) {
        return _decimals;
    }
}