Comment by bigdict

  int main (int argc, char* argv[]) {
  
      (void)argc;
      (void)argv;

      struct Meow* p_cat = (struct Meow*)malloc(sizeof(struct Meow));
      struct Bark* p_dog = p_cat;
      // :3
 
      return 0;
  }

Why declare main that way if you are going to discard the arguments?

Why cast the malloc? This isn't C++.