code: def build_command(chunks):
      
  
      if not chunks:
          raise ValueError(
              "No command parts: {} ({})".format(chunks, type(chunks)))
  
      if isinstance(chunks, str):
          return chunks
  
      parsed_pieces = []
  
      for cmd_part in chunks:
          if cmd_part is None:
              continue
          try:
              # Trim just space, not all whitespace.
              # This prevents damage to an option that specifies,
              # say, tab as a delimiter.
              parsed_pieces.append(cmd_part.strip(" "))
          except AttributeError:
              option, argument = cmd_part
              if argument is None or argument == "":
                  continue
              option, argument = option.strip(" "), str(argument).strip(" ")
              parsed_pieces.append("{} {}".format(option, argument))
  
      return " ".join(parsed_pieces)
docs: Create a command from various parts.
  
      The parts provided may include a base, flags, option-bound arguments, and
      positional arguments. Each element must be either a string or a two-tuple.
      Raw strings are interpreted as either the command base, a pre-joined
      pair (or multiple pairs) of option and argument, a series of positional
      arguments, or a combination of those elements. The only modification they
      undergo is trimming of any space characters from each end.
  
      :param Iterable[str | (str, str | NoneType)] chunks: the collection of the
          command components to interpret, modify, and join to create a
          single meaningful command
      :return str: the single meaningful command built from the given components
      :raise ValueError: if no command parts are provided