code: def execute
        File.open(out_file, 'w') do |o|
          File.new(in_file, 'r').each_with_index do |line, index|
            extraction = col_filter.process(row_filter.process(line.chomp, row: index))
            o.puts extraction unless extraction.nil?
          end
        end
      end
docs: Creates a new extractor
   Executes the extractor