code: def int_to_decimal_str(integer):
      
      int_string = str(integer)
      if len(int_string) < 2:
          return "0." + int_string.zfill(2)
      else:
          return int_string[:-2] + "." + int_string[-2:]
docs: Helper to convert integers (representing cents) into decimal currency
      string. WARNING: DO NOT TRY TO DO THIS BY DIVISION, FLOATING POINT
      ERRORS ARE NO FUN IN FINANCIAL SYSTEMS.
      @param integer The amount in cents
      @return string The amount in currency with full stop decimal separator