code: def normalize_id(string):
      
      if not isinstance(string, basestring):
          fail("Type of argument must be string, found '{}'"
               .format(type(string)))
      # get the id nomalizer utility
      normalizer = getUtility(IIDNormalizer).normalize
      return normalizer(string)
docs: Normalize the id
  
      :param string: A string to normalize
      :type string: str
      :returns: Normalized ID
      :rtype: str