# File lib/core/facets/string/cleanlines.rb, line 9
  def cleanlines(&block)
    if block
      scan(/^.*?$/) do |line|
        block.call(line.strip)
      end
    else
      Enumerator.new(self) do |output|
        scan(/^.*?$/) do |line|
          output.yield(line.strip)
        end
      end
    end
  end