Your task is to implement simple CRUD API using in-memory database underneath.

1. The task must be solved using only express and proveded packages in package.json. Any libraries and packages are prohibited.
2. API path /person:
   • GET /person or /person/${personId} should return all persons or person with corresponding personId
   • POST /person is used to create record about new person and store it in database
   • PUT /person/${personId} is used to update record about existing person
   • DELETE /person/${personId} is used to delete record about existing person from database
3. Persons are stored as objects that have following properties:
   • id — unique identifier (string, uuid) generated on server side
   • name — person's name (string, required)
   • age — person's age (number, required)
   • hobbies — person's hobbies (array of strings or empty array, required)
4. Requests to non-existing endpoints (e.g. /some-non/existing/resource) should be handled.
5. Internal server errors should be handled and processed correctly.
6. Make sure the api is accesible by frontend apps hosted on a different domain (cross-site resource sharing)