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Design and implement a Java application for the following requirements

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Design and implement a Java application for the following requirements. You may
choose up to 3 design patterns. Include a class diagram for your design. All
submissions should be committed to the assigned Github repo. Please include a
README file with very clear instructions on how to build and run your application.
Please make sure that the name of the main class of your project is 'Billing'
Requirements:
The application should maintain an internal, static database (inventory of stock) (this
may be developed using HashMaps and/or other built-in Java Data structures). This
means once we re-run the program, the changes to the data would not persist. We will
provide the data that has to be maintained. The data will contain the following tables
and fields:
(Sample input file and sample data set for the inventory would be provided separately)
Table 1: Items
? Category (Essentials, Luxury, Miscellaneous)
? Item for each category (Essentials - Clothes, soap, milk; Luxury - perfume,
chocolates; Misc - Bedsheets, footwear)
? The available Quantity of each item
? Price of each item
Table 2: Cards
? Card Numbers
2. Input CSV file will contain an order including Items, Quantity needed, and the
payment card number.
3. Input file should be processed as follows:
? Validate if the requested quantity for each item is permissible. For example, if
the request is to order 3 soaps, check the database if we have at least 3
soaps in our inventory.
? There will be a cap on the quantity of each category that can be ordered in
one single order. For example, restrict Essentials to a maximum of 3, Luxury
to 4, and Misc to 6. (This will be configured beforehand)
? In case it is an incorrect request, generate and output TXT file with message
"Please correct quantities." and include the items with incorrect quantities
? After this validation, if the cart is valid, calculate prices for the cart.
? Take the card number of the user and if it is not present in DB add it.
? Output the CSV list with the total amount paid.
Please refer to the attached file for Inventory, Sample Input and output files. If you
cannot proceed with an input transaction for any reasons mentioned above, generate an
output TXT with a reason for the same.