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