def check_columns
      @found_files.each do |file|
        @temp_files[file.filename].open do |data|
          FileReader.new(data, file, validate: true)
        end
      end
    end
def check_columns
      @found_files.each do |file|
        @temp_files[file.filename].open do |data|
          FileReader.new(data, file, validate: true)
        end
      end
    end
Check that every file has its required columns