public static function RemoveWorkingDir( string $path = null ) : string
   {

      if ( \is_null( $path ) )
      {
         return '';
      }

      $wd = '~^' . \preg_quote( static::Unixize( \getcwd() ) . '/' ) . '~';

      return \preg_replace( $wd, '', static::Unixize( $path ) );

   }