Analysis of system design: Food intermediary application on Android platform

enter image description here Hello everyone, I have an Analysis of system design: Food intermediary application on Android platform

I draw a general usecasr diagram: you pay attention to the shopping cart management Here the customers and the store can manage it (the teacher instructed me) but I find it makes no sense.

because in the shopping cart function there is an order management function inside * customer :                   Cart management:                          - add product to cart                          - fix product in cart                          - delete products in the cart                          - Order management:                                 + view orders                                 + cancel the order

• store:                    Cart management:                          * Order management                             - View orders                             - edit order                             - Order confirmation                             - Cancel order

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1: https://i.stack.imgur.com/m2M0K.pngstrong text