code: def preferred_format(incomplete_format, preferred_formats):
      
      incomplete_format = long_form_one_format(incomplete_format)
      if 'format_name' in incomplete_format:
          return incomplete_format
  
      for fmt in long_form_multiple_formats(preferred_formats):
          if ((incomplete_format['extension'] == fmt['extension'] or (
                  fmt['extension'] == '.auto' and
                  incomplete_format['extension'] not in ['.md', '.Rmd', '.ipynb'])) and
                  incomplete_format.get('suffix') == fmt.get('suffix', incomplete_format.get('suffix')) and
                  incomplete_format.get('prefix') == fmt.get('prefix', incomplete_format.get('prefix'))):
              fmt.update(incomplete_format)
              return fmt
  
      return incomplete_format
docs: Return the preferred format for the given extension