code: def decode(string, base):
      
  
      base = int(base)
      code_string = get_code_string(base)
      result = 0
      if base == 16:
          string = string.lower()
      while len(string) > 0:
          result *= base
          result += code_string.find(string[0])
          string = string[1:]
      return result
docs: Given a string (string) and a numeric base (base),
      decode the string into an integer.
  
      Returns the integer