gistfile1.rb

until tower3 == [3,2,1]
  choice_array = moving_from_to_array(tower1, tower2, tower3)
  chip_moving = choice_array[0].pop
    if chip_moving == nil       # if this happens, start again on line 2
      puts "You cant do that, try again"
    end
  choice_array[1].push(chip_moving)
  display(tower1, tower2, tower3)
end