token_factory.sol

pragma solidity 0.5.10;

contract Token {
    string public name;
    string public symbol;
    mapping(address => uint256) public balances;
    
    constructor(string memory _name, string memory _symbol) public {
        name = _name;
        symbol = _symbol;
    }
}

contract TokenFactory {
    event TokenCreated(Token newToken);
    
    function createNewToken(string calldata name, string calldata symbol) external {
        Token token = new Token(name, symbol);
        emit TokenCreated(token);
    }
}