Design an e-commerce system that has these features:

• Define products with name, price and quantity.
• Some products may expire like Cheese and Biscuits while others may not expire like TV and Mobile.
• Some products may require shipping like Cheese and TV, other products like Mobile scratch cards may not require so. every shippable item should provide its weight.
• Customers should be able to add a product to cart with specific quantity not more than the available product quantity.
• Customers are able to do checkout with items in the cart.
  • Print in the console checkout details like
    • order subtotal (sum of all items’ prices)
    • shipping fees
    • paid amount (subtotal + shipping fees)
    • customer current balance after payment
  • Give an error if
    • Cart is empty
    • Customer's balance is insufficient.
    • one product is out of stock or expired.
  • If applicable, collect all items that need to be shipped and send them to ShippingService which accepts a list of objects implementing an interface containing only String getName() and double getWeight() methods.

Notes:

• The solution is to be submitted with any programming language (Java is recommended).
• Cover corner cases, Provide assumptions when needed.
• Solutions based on AI-generated content are not permitted.
• Provide code examples that prove your code is working as expected covering all use cases, for example:

cart.add(cheese, 2);
cart.add(tv, 3);
cart.add(scratchCard, 1);

checkout(customer, cart);

CONSOLE OUTPUT

- * Shipment notice **

2x Cheese        400g

1x Biscuits      700g

Total package weight 1.1kg

- * Checkout receipt **

2x Cheese        200

1x Biscuits      150

- ---------------------

Subtotal         350

Shipping         30

Amount           380

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