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char *dupstring(const char *c_str) {
  size_t len;
  char *dup;

  len = strlen(c_str);
  dup = (char *)malloc(len + 1);
  assert(NULL != dup);

  memcpy(dup, c_str, len + 1);
  return dup;
}

char *dupstring(const char *c_str) {
  size_t len;
  char *dup;

  len = strlen(c_str);
  dup = (char*)malloc(len + 1);
  /* detect and handle memory allocation error */
  if (NULL == dup) {
      return NULL; 
  }

  memcpy(dup, c_str, len + 1);
  return dup;
}