Assignment 23

Take what we did in class with the Walmart API, and expand it to include the following functionality:
When the user searches for a product, allow the user to enter the product id (from the search results). For the product indicated, create an InvoiceItem object and add it to your Invoice object
Add the category to the InvoiceItem
After the user adds a product to the invoice (using your InvoiceItem class), loop and allow them to search again
When the user hits ENTER instead of a SEARCH term or a product id, print out the same result as in Assignment 22.

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