code: def _process_group(input_group, required_group, groupname, append_subgroups=None):
      
      if append_subgroups is None:
          append_subgroups = []
      tool_options = {}
      for key in input_group:
          _ensure_set_contains(input_group[key], required_group.get(key, {}), groupname + '::' + key)
          if key in append_subgroups:
              continue
          else:
              tool_options[key] = input_group[key]
      for key in input_group:
          if key in append_subgroups:
              continue
          else:
              for yek in append_subgroups:
                  tool_options[key].update(input_group[yek])
      return tool_options
docs: Process one group from the input yaml.  Ensure it has the required entries.  If there is a
      subgroup that should be processed and then appended to the rest of the subgroups in that group,
      handle it accordingly.
  
      :param dict input_group: The dict of values of the input group
      :param dict required_group: The dict of required values for the input group
      :param str groupname: The name of the group being processed
      :param list append_subgroups: list of subgroups to append to each, other subgroup in this group
      :return: processed dict of entries for the group
      :rtype: dict