I have a really big problem because I have to call the file with the same name twice and I have this error all the time:

ELF binary type "0" not known.
-bash: ./a.out: cannot execute binary file: Exec format error

https://pastebin.pl/view/6dd51419

I have to write a game for two people like udp so that they are logged in on different machines, and I can't even run a program with the same name in a different terminal ...

I would like to see what that link has but I get "This site can’t be reached" so I can't. Daniweb allows code and images to be put in your discussion so next try supplying that here.

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