A simple vending machine emulator. Takes input of items from init_values.yml file.
Keeps track of the available inventory, you can order items that are in stock only.
Keeps track of available coins in the till, which are also initialized from init_values.yml. If change can't be provided it'll return coins already slotted by the user.
Finds the best possible way to return change using minimum amount of coins from the available coins in the till. The coins used in the initialize values allow to use greedy algorithm of finding coin change. Dynamic programming approach is also implemented in case the requirements change.
Run bundle install to install necessary gems for tests.
Make sure that ruby 3.2.0 is installed although any version above 3 should be fine too.
Run ./start.rb to run the program.
Run bundle exec rspec spec to execute tests.