The Festival is going well. Attendees are entering by redeeming tickets and enjoying it. It is now time for the organizer to cash out the benefits.
You will use a Smart Contract to send the benefits in ETH to the organizer.
### Instructions
- Create a new Smart Contract `FunAndProfit` that implements the functions `buyTicket()` and `ticketsOf()` from the prior exercise.
- Add a function `redeemTicket()` that allows an attendee to give return one ticket. The function should fail (revert) if the attendee does not own any ticket.
- Add a function `getBenefits()` that sends all the benefits from the Festival to the organizer.
