code: def unique_prefix(self, area_uuid):
          
          for prefix_len in range(1, len(area_uuid)):
              prefix = area_uuid[0:prefix_len]
              matching_areas = [uuid for uuid in self.areas if re.match(prefix, uuid)]
              if len(matching_areas) == 1:
                  return prefix
docs: Find the minimum prefix required to address this Upload Area UUID uniquely.
          :param (str) area_uuid: UUID of Upload Area
          :return: a string with the minimum prefix required to be unique
          :rtype: str