code: @Nullable
    @CheckReturnValue
    public static String trim (@Nullable final String s)
    {
      return hasNoText (s) ? s : s.trim ();
    }
docs: Trim the passed string, if it is not <code>null</code>.
  
  @param s
  The string to be trimmed. May be <code>null</code>.
  @return <code>null</code> if the input string was <code>null</code>, the
  non-<code>null</code> trimmed string otherwise.
  @see String#trim()