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: installfest.rb
    path of file: ./repos/docs/lib/site_extensions
    
    the code of the file until where you have to start completion: module StepExtensions
  module Installfest
    def version_string(name)
      case name
        when :ruby_short
          '2.3.8'
        when :windows_rubygems_min
          '2.6.7
    
    def version_string(name)
      case name
        when :ruby_short
          '2.3.8'
        when :windows_rubygems_min
          '2.6.7'
        when :windows_rubygems_min_short
          '2.6'
        else
          raise StandardError, "No version string exists for '#{name}'"
      end