@Contract(value = "null -> true", pure = true)
  public static boolean isEmptyOrSpaces(@Nullable String s) {
    if (isEmpty(s)) {
      return true;
    }
    for (int i = 0; i < s.length(); i++) {
      if (s.charAt(i) > ' ') {
        return false;
      }
    }
    return true;
  }
@Contract(value = "null -> true", pure = true)
  public static boolean isEmptyOrSpaces(@Nullable String s)