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: versions_controller.rb
    path of file: ./repos/openproject/app/controllers
    
    the code of the file until where you have to start completion: #-- copyright
# OpenProject is an open source project management software.
# Copyright (C) 2012-2024 the OpenProject GmbH
#
# This program is free
    
  def render_cu(call, success_message, failure_action)
    @version = call.result

    if call.success?
      flash[:notice] = t(success_message)
      redirect_back_or_version_settings
    else
      render action: failure_action
    end