You have been contracted to build a software application for a pet day care company. This company has many day care centers and would like to be able to track data on each one of them. Specifically, they would like you to implement the following features:
- Each Day Care has a unique name, as well as a way to read that data.
- Each Day Care has multiple customers, and each of those customers can have multiple pets.
- A Day Care can find a customer by the customer's id
- A Day Care can list all pets that are unfed
The day care company would like to be able to feed all of its unfed pets and charge customers for feeding their pets. Each day care has its own price that it charges to feed a pet, and this price should vary depending on what type of pet it is (dog, cat, etc.).