@Contract(pure = true)
  public static boolean containsWhitespaces(@Nullable CharSequence s) {
    if (s == null) return false;

    for (int i = 0; i < s.length(); i++) {
      if (Character.isWhitespace(s.charAt(i))) return true;
    }
    return false;
  }
@Contract(pure = true)
  public static boolean containsWhitespaces(@Nullable CharSequence s)