C :: File Contents Printing And Saving With Filename Whenever Try To Send

I am trying to establish a connection between client and server to send a file to the server from a client. I have been successfully able to send files to the server but i am facing a problem with the the filename whenever i try to send any string to the server and use it in naming the filename at the server side, the string is successfully concatenated but it saves the filecontents in the filename.

for example: i am sending a file hello1.txt to server and the server has to save it as abcxyz.txt as i am sending the "xyz" from the client. BUT Whenever i am doing this ,the file saves as abcxyzfilecontents.txt If i saved in the .txt file "you123" ,my file at server side would save as abcxyzyou123.txt

Here are my codes:

Know that the server code implements a multi threaded server. The functionality to be discussed is defined in myfunc

Code:
server.c:
#include <stdlib.h>
#include <stdio.h>

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