[gameprogrammer] problem filling a buffer

I have a problem with the udp packet data creation. I still dont deeply underestand pointers, and I need to fill the data buffer with several different data, like this: command, user login string length, login string, password string length, password string For simple data types like integers I have a working method. But when I send strings I receive some extra garbage at the end, making the login process fail. 
I would appreciate any suggestion to deal with this problem

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