shuffle_method.rb

def shuffle sorted_array, unsorted_array
  counter = sorted_array.count - 1
  rand_number = (rand(counter))
  
  temp = sorted_array[rand_number]
  sorted_array.delete_at(rand_number)
  unsorted_array << temp
  
  if sorted_array.count >= 1
    shuffle sorted_array,unsorted_array
  else
    puts unsorted_array
  end
end

lett = %w[a b c d e f g h i j]
shuffle lett, []