This exercise is designed to demonstrate a candidate's abilities across a range of competencies in software development (The applicant can pick any language of their preference)

1. Fork the repository
2. Implement a solution of the Requirements (feel free to use any helper packages/frameworks that you think think will be of help)
3. Share the forked repository

• Create a basic Groceries Shop till which can scan fruits and vegetables of different types, producing a numeric result/bill in the end. Assume the currency is called aws and there is 100 cloud ('c' for short) in 1 aws
• Apart from simply adding the value of each product, the till should contain logic for the following special deals:
  • 2 for 3 - for a given selection of items (customer buys 3 items but only pays for the value of 2 of them, the cheapest one is free). In case there are more than 3 items that are included in the 2 for 3 deal, the first 3 items are included. Example Deal ["banana", "orange", "tomato"], example items scanned ["banana", "orange", "orange", "tomato"] - the tomato is not included in the discount (the cheaper of banana or orange will be subtracted)
  • buy 1 get 1 half price - for a given selection of items (if the customer buys a given product under such offer, they receive a 50% reduction in the price of a second item of the same type)
• The till should be programmable so that whoever runs it can define 2 inputs:
  • The list of items supported by the till - each item with a given "price", "name"
  • Once a new item is added to the till, the administrator should be able to add it to any of the 2 special deals defined above
  • You should be able to scan a list of items and see the end price (any special deal discounts should be subtracted)

Input groceries:

Input deals:

• 2 for 3 - ["apple", "banana", "tomato"]
• buy 1 get 1 half price - potato

Example scanned customer basket: "apple", "banana", "banana", "potato", "tomato", "banana", "potato"

Expected Output: 1 aws and 99 clouds Explanation:

The items are processed(Scanned) in order:

• "apple", "banana", "banana" are picked up for the 2 for 3 deal and 1 of the bananas is free - total cost 90c

• "potato", "tomato", "banana", "potato" are left. There is a buy 1 get 1 half price for potatoes, meaning the second potato will be half price (13c) so it will be 39c for both

• The other 2 items scanned tomato and banana are not part of any deals so they are charged their basic price 70c total

The total amount the is equal to: 90c + 39c + 70c = 1 aws and 99 clouds (199 clouds = 1.99 aws)

You will be scored on the following:

• Code cleanliness and ease of understandability
• Code tests
• Code reusability
• Code modularity (i.e. ease of extension)
• Documentation

You are free to make your solution to this exercise as simple or as complicated as you want based off the above criteria. The end result can come in the for of either of the options below:

• REST/HTTP API
• User interface (web app)
• Application CLI