refactor(remove-comments): unnecessary comments were removed and alsobugs undefined variables were created in /client_server/fork.h, /client_server/udp_client.c and /client_server/udp_server.c

refactor(remove-comments): unnecessary comments were removed and alsobugs undefined variables were created in /client_server/fork.h, /client_server/udp_client.c and /client_server/udp_server.c #2784