    constructor(string memory name_, string memory symbol_, uint256 totalSupply_) public {
        _name = name_;
        _symbol = symbol_;
	    _initialSupply = totalSupply_;
	    _totalSupply = totalSupply_;
    }
...
    function _mint(address account, uint256 amount) internal   {
        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);

        _afterTokenTransfer(address(0), account, amount);
    }
    constructor(string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;
    }
    constructor() ERC20("Note", "NOTE") {
        admin = msg.sender;
    }
