code: def camel_case(arg, capitalize=None):
      
      ensure_string(arg)
      if not arg:
          return arg
  
      words = split(arg)
      first_word = words[0] if len(words) > 0 else None
  
      words = [word.capitalize() for word in words]
      if first_word is not None:
          if capitalize is True:
              first_word = first_word.capitalize()
          elif capitalize is False:
              first_word = first_word[0].lower() + first_word[1:]
          words[0] = first_word
  
      return join(arg.__class__(), words)
docs: Converts given text with whitespaces between words
      into equivalent camel-cased one.
  
      :param capitalize: Whether result will have first letter upper case (True),
                         lower case (False), or left as is (None, default).
  
      :return: String turned into camel-case "equivalent"