code: @Nullable
    @CheckReturnValue
    public static String trimStartAndEnd (@Nullable final String sSrc, @Nullable final String sValueToTrim)
    {
      return trimStartAndEnd (sSrc, sValueToTrim, sValueToTrim);
    }
docs: Trim the passed lead and tail from the source value. If the source value does
  not start with the passed trimmed value, nothing happens.
  
  @param sSrc
  The input source string
  @param sValueToTrim
  The string to be trimmed of the beginning and the end
  @return The trimmed string, or the original input string, if the value to
  trim was not found
  @see #trimStart(String, String)
  @see #trimEnd(String, String)
  @see #trimStartAndEnd(String, String, String)