code: def name_insertion(sbjct_seq, codon_no, sbjct_nucs, aa_alt, start_offset):
      
      start_codon_no = codon_no - 1
      if len(sbjct_nucs) == 3:
          start_codon_no = codon_no
      start_codon = get_codon(sbjct_seq, start_codon_no, start_offset)
      end_codon = get_codon(sbjct_seq, codon_no, start_offset)
      pos_name = "p.%s%d_%s%dins%s"%(aa(start_codon), start_codon_no, aa(end_codon), codon_no, aa_alt)
      return pos_name
docs: This function is used to name a insertion mutation based on the HGVS 
      recommendation.