code: def roman_to_int(roman_string):
      
      roman_string = roman_string.upper().strip()
      if "IIII" in roman_string:
          raise ValueError("Malformed roman string")
      value = 0
      skip_one = False
      last_number = None
      for i, letter in enumerate(roman_string):
          if letter not in _roman_dict:
              raise ValueError("Malformed roman string")
          if skip_one:
              skip_one = False
              continue
          if i < (len(roman_string) - 1):
              double_check = letter + roman_string[i + 1]
              if double_check in _roman_dict:
                  if last_number and _roman_dict[double_check] > last_number:
                      raise ValueError("Malformed roman string")
                  last_number = _roman_dict[double_check]
                  value += _roman_dict[double_check]
                  skip_one = True
                  continue
          if last_number and _roman_dict[letter] > last_number:
              raise ValueError("Malformed roman string")
          last_number = _roman_dict[letter]
          value += _roman_dict[letter]
      return value
docs: Converts a string of roman numbers into an integer.
  
      .. code: python
  
          reusables.roman_to_int("XXXVI")
          # 36
  
  
      :param roman_string: XVI or similar
      :return: parsed integer