docs: def find_largest_contig(contig_lengths_dict):
      """
      Determine the largest contig for each strain
      :param contig_lengths_dict: dictionary of strain name: reverse-sorted list of all contig lengths
      :return: longest_contig_dict: dictionary of strain name: longest contig
      """
      # Initialise the dictionary
      longest_contig_dict = dict()
      for file_name, contig_lengths in contig_lengths_dict.items():
          # As the list is sorted in descending order, the largest contig is the first entry in the list
          longest_contig_dict[file_name] = contig_lengths[0]
      return longest_contig_dict