code: @Nullable
    public static String getUnifiedURL (@Nullable final String sURL)
    {
      return sURL == null ? null : sURL.trim ().toLowerCase (Locale.US);
    }
docs: Get the unified version of a URL. It trims leading and trailing spaces and
  lower-cases the URL.
  
  @param sURL
  The URL to unify. May be <code>null</code>.
  @return The unified URL or <code>null</code> if the input address is
  <code>null</code>.