Edit Cart

[leaov4]

As a user, I want to edit my cart if I change my mind.

• change the quantity of a product in my cart.

• remove a product in my cart.

• No one else should be able to edit my cart except me.

Tasks:

• update cart state to change an item's quantity
• cart has items that have name, price, quantity
• delete item in cart state
• use sessions so no one else can update cart besides current user