code: def iter_last_tour(tourfile, clm):
      
      row = open(tourfile).readlines()[-1]
      _tour, _tour_o = separate_tour_and_o(row)
      tour = []
      tour_o = []
      for tc, to in zip(_tour, _tour_o):
          if tc not in clm.contigs:
              logging.debug("Contig `{}` in file `{}` not found in `{}`"
                            .format(tc, tourfile, clm.idsfile))
              continue
          tour.append(tc)
          tour_o.append(to)
      return tour, tour_o
docs: Extract last tour from tourfile. The clm instance is also passed in to see
      if any contig is covered in the clm.