contract FxERC20 is IFxERC20, ERC20 {
    address internal _fxManager;
    address internal _connectedToken;

    function initialize(
        address fxManager_,
        address connectedToken_,
        string memory name_,
        string memory symbol_,
        uint8 decimals_
    ) public override {
        require(_fxManager == address(0x0) && _connectedToken == address(0x0), "Token is already initialized");
        _fxManager = fxManager_;
        _connectedToken = connectedToken_;

        // setup meta data
        setupMetaData(name_, symbol_, decimals_);
    }

    // fxManager rturns fx manager
    function fxManager() public view override returns (address) {
        return _fxManager;
    }

    // connectedToken returns root token
    function connectedToken() public view override returns (address) {
        return _connectedToken;
    }

    // setup name, symbol and decimals
    function setupMetaData(
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) public {
        require(msg.sender == _fxManager, "Invalid sender");
        _setupMetaData(_name, _symbol, _decimals);
    }

    function mint(address user, uint256 amount) public override {
        require(msg.sender == _fxManager, "Invalid sender");
        _mint(user, amount);
    }

    function burn(address user, uint256 amount) public override {
        require(msg.sender == _fxManager, "Invalid sender");
        _burn(user, amount);
    }
}
/**
 * @title FxERC20 represents fx erc20
 */
function connectedToken() public view override returns (address) {
        return _connectedToken;
    }
// connectedToken returns root token