Chore: Use NULL instead of 0

Implementierung/main.c

@@ -97,8 +97,8 @@ int main(int argc, char** argv) {
         static struct option longOptions[] =
         {
             /* These options set a flag. */
-            {"help", no_argument, 0, 'h'},
-            {0, 0, 0, 0}
+            {"help", no_argument, NULL, 'h'},
+            NULL
         };
         int longOptionIndex = 0;