Challenge: The Limited Drop Lockdown

A famous brand is releasing a limited edition hoodie with only 10 available. There are 50 threads simulating customers trying to buy the hoodie at the same time. Your task is to ensure that exactly 10 hoodies are sold and no more, using a lock to prevent race conditions.

• Use the provided lock object to synchronize access to the shared variable hoodies_in_stock.
• In the buy_hoodie function, acquire the lock before checking and updating the stock.
• Simulate payment processing by adding a tiny delay (e.g., time.sleep(0.01)) while holding the lock.
• If a hoodie is available, decrement hoodies_in_stock and add the customer_id to the dropped_customers list.
• After all threads finish, exactly 10 customer IDs should be in dropped_customers, and hoodies_in_stock should be 0.