static void
argument_passing (struct process_args *args, void **esp_)
{
  void *esp = *esp_;
  void *org_esp = esp;
  int argc = args->argc;
  char *argv_ptr[argc + 1];
  for (int i = 0 ; i < argc ; i++)
    {
      int len = strlen (args->argv[i]);
      esp -= (len + 1) * sizeof (char);
      strlcpy (esp, args->argv[i], len + 1);
      argv_ptr[i] = esp;
      printf ("%p\targv[%d] data\t%s\n", esp, i, (char *) esp);
    }
  esp -= ((int)esp % 4 + 4) % 4;
  argv_ptr[argc] = NULL;
  for (int i = argc ; i >= 0 ; i--)
    {
      esp -= sizeof (char *);
      memcpy (esp, &argv_ptr[i], sizeof (char *));
      printf ("%p\targv[%d] pointer\t%p\n", esp, i, *(void **)esp);
    }

  memcpy (esp - sizeof(char **), &esp, sizeof (char **));
  esp -= sizeof (char **);
  printf ("%p\targv pointer\t%p\n", esp, *(void **)esp);
  esp -= sizeof (int);
  memcpy (esp, &argc, sizeof (int));
  printf ("%p\targc\t\t%d\n", esp, *(int *)esp);
  esp -= sizeof (int);
  memset (esp, 0, sizeof (int));
  printf ("%p\treturn address\t%p\n", esp, *(void **)esp);
  printf ("Stack Size: %d\n", esp - org_esp);
}