Post_22.3.rb

def assign_random_santa
  santa_shuffled = @santa_shuffled.clone
  santa_list = @santa_list.clone
    santa_list.each do |person|
      potential_partner = santa_shuffled [ rand ]
      potential = santa_shuffled.select{ |potential_person| person.not_self(potential_person) }
      person.assigned_santa = potential [ rand ] unless potential.empty?
      santa_shuffled.delete(person.assigned_santa)
  end
  santa_list
end