docs: def _parse_title_url(html_chunk):
      """
      Parse title/name of the book and URL of the book.
  
      Args:
          html_chunk (obj): HTMLElement containing slice of the page with details.
  
      Returns:
          tuple: (title, url), both as strings.
      """
      title = html_chunk.find("div", {"class": "comment"})
  
      if not title:
          return _parse_alt_title(html_chunk), None
  
      title = title[0].find("h2")
      if not title:
          return _parse_alt_title(html_chunk), None
  
      # look for the url of the book if present
      url = None
      url_tag = title[0].find("a")
      if url_tag:
          url = url_tag[0].params.get("href", None)
          title = url_tag
  
      return title[0].getContent(), normalize_url(BASE_URL, url)