Where can I find the extra credit assignment?

def create_list
  print "What is the name of the list? "
  name = gets.chomp
  hash = { "name" => name, "list" => Array.new }
  return hash
end

def add_list_item 
  print "What is the item? "
  item_name = gets.chomp  
  print "What is the quantity? "
  quantity = gets.chomp.to_i
  hash = { "name" => item_name, "quantity" => quantity }
  return hash
end


def print_list(list)
  puts "SHopping List Name: #{list["name"]}"
  puts "------"  
  list["list"].each do |item|
    puts "Item Name: #{item["name"]}"
    puts "Item Quantity: #{item["quantity"].to_s}"
    puts "------" 
  end
end



shop_list = create_list()

answer = ""

while answer != "q"
  item = add_list_item()
  shop_list["list"].push(item)
  print "Enter q to quit "
  answer = gets.chomp
  break if answer == "q"  
end


print_list(shop_list)