You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: namespace.rb
    path of file: ./repos/lita/lib/lita
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require "i18n"

require_relative "util"
    
    def namespace(value = nil)
      @namespace = value.to_s if value

      string_name = defined?(@namespace) ? @namespace : name

      if string_name
        Util.underscore(string_name.split("::").last)
      else
        raise I18n.t("lita.plugin.name_required")
      end