code: def translate_codon(codon, aa_pos):
      
      # not handling rare Leucine or Valine starts!
      if aa_pos == 0 and codon in START_CODONS:
          return "M"
      elif codon in STOP_CODONS:
          return "*"
      else:
          return DNA_CODON_TABLE[codon]
docs: Translate a single codon into a single amino acid or stop '*'
  
      Parameters
      ----------
      codon : str
          Expected to be of length 3
      aa_pos : int
          Codon/amino acid offset into the protein (starting from 0)