function refundMoneyForUser(bytes32 _username) public {
        require(data.getLastTipTime(msg.sender, _username) < (now - 2 weeks));
        require(!checkUsernameVerified(_username));

        uint toSend = data.getTip(msg.sender, _username);
        data.removeTip(msg.sender, _username);
        msg.sender.transfer(toSend);

        events.refundSuccessful(msg.sender, _username);
    }