instead of using perror() use printf(). Removes ugly and useless error codes. While here move function to *.c

fiche.h

@@ -80,7 +80,7 @@ int create_directory(char *slug);
 int check_protocol(char *buffer);
 
 void bind_to_port(int listen_socket, struct sockaddr_in serveraddr);
-void error(char *error_code){perror(error_code); exit(1);}
+void error(char *buffer);
 void perform_connection(int listen_socket);
 void generate_url(char *buffer, char *slug, size_t slug_length, struct client_data data);
 void save_to_file(char *buffer, char *slug, struct client_data data);