sanitizer.rb

data = []

File.open("Gemfile").each do |line|
  data << line if line.size > 1 unless line.include?("#")
end

File.delete("Gemfile")

File.open("Gemfile", 'w') do |file|
  data.unshift("# frozen_string_literal: true \n\n")
  data.each do |line|
    file.write("\n") if line.include?("group :")
    file.write(line)
  end
end