all_supplies_in_holidays.rb

# given that holiday_hash looks like this:
# {
#   :winter => {
#     :christmas => ["Lights", "Wreath"],
#     :new_years => ["Party Hats"]
#   },
#   :summer => {
#     :fourth_of_july => ["Fireworks", "BBQ"]
#   },
#   :fall => {
#     :thanksgiving => ["Turkey"]
#   },
#   :spring => {
#     :memorial_day => ["BBQ"]
#   }
# }

def all_supplies_in_holidays(holiday_hash)
  # iterate through holiday_hash and print items such that your readout resembles:
  # Winter:
  #   Christmas: Lights, Wreath
  #   New Years: Party Hats
  # Summer:
  #   Fourth Of July: Fireworks, BBQ
  # etc.
  holiday_hash.each do |season, holiday|
    puts "#{season.to_s.capitalize}:"
    holiday.each do |holiday_name, supplies|
      puts "  #{holiday_name.to_s.split("_").collect {|split_holiday_name| split_holiday_name.capitalize}.join(" ")}: #{supplies.join(", ")}"
    end
  end
end