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: gem_statistics.rb
    path of file: ./repos/rails_stats/lib/rails_stats
    
    the code of the file until where you have to start completion: module RailsStats
  clas
    
    def calculate_total
      out = CodeStatisticsCalculator.new
      @statistics.each do |key, stats|
        out.add(stats)
      end
      out
    end