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#define MAX_SIZE_ALLOWED 1000

int main(int argc, char *argv[]) {
  char *str = NULL;
   size_t len;

  if (argc == 2) {
    len = strlen(argv[1])+1;
    if (len > MAX_SIZE_ALLOWED) {
      /* Handle Error */
    }
    str = malloc(len);
    if (str == NULL) {
      /* Handle Allocation Error */
    }
    strcpy(str, argv[1]);
  }
  else {
    printf("usage: $>a.exe [string]\n");
    return -1;
  }
  /* ... */
  free(str);
  return 0;
}