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As best as I can tell, the file client.c is not relevant. I doubt that the file was used at all. The error is from the command prompt. Somehow it is trying to execute a program called 00 and of course that does not work. It cannot find a program called 00.
I see in the upper-left of the window the title bar says C:\Users\x\Desktop\Client.exe. I think you are not executing the correct Windows Command Processor.