A code I made for copying a part of the content in every line

siafem.rb

notes = []
File.open("test.txt").each do |line|
  # record in a array var all the lines until find [fim]
  notes.push(line)
  if (line.include? "TOTAL DO EMPENHO:")
    # get total empenho value
    total_empenho = notes[-1]
    total_empenho = total_empenho.slice(18,11)
    # puts total_empenho

    # Remove last 2 lines from array
    puts notes
    line_emp2 = notes.pop(1).to_s
    notes.pop(1).to_s
    line_emp2 = line_emp2.slice(2, line_emp2.size - 6)

    # for each key until reach "TOTAL DO EMPENHO:" add total empenho at the begining
    notes.each do |note|
      note = total_empenho + " " + note
      File.open("out.txt", 'a+') {|f| f.write(note) }
    end
    File.open("out.txt", 'a+') {|f| f.write(line_emp2) }
    File.open("out.txt", 'a+') {|f| f.write("\n") }

    # clean up notes
    notes = []
  end
end