Move Java files into folders

move_java.rb

Dir.glob("*.java").each do |f|
  contents = File.read f

  folder = contents.
    split("\n").
    first.
    delete("/").
    delete(" ").
    delete(",test").
    delete(",implementation").
    gsub(".","_").
    gsub("P","P_")

  system "mkdir -p #{folder}"
  system "mv #{f} #{folder}"
end