def report(measurements)
      width = measurements.max_by { |m| m.label.size }.label.size + 1
      puts "#{' ' * width}#{Benchmark::CAPTION}"
      measurements.each do |m|
        puts "#{m.label.to_s.ljust width} #{m}"
      end
    end
def report(measurements)
      width = measurements.max_by { |m| m.label.size }.label.size + 1
      puts "#{' ' * width}#{Benchmark::CAPTION}"
      measurements.each do |m|
        puts "#{m.label.to_s.ljust width} #{m}"
      end
    end
output benchmark results