def decommission_group(name)
      group = group_items(name)

      group.each do |item|
        deallocate(item)
      end

      groups.delete(name)

      return name
    end
def decommission_group(name)
      group = group_items(name)

      group.each do |item|
        deallocate(item)
      end

      groups.delete(name)

      return name
    end
Remove a group and free its allocated item addresses.