holiday_cost_calculator

1. This program calculates user's total holiday cost.
2. Calculate and return the hotel cost based on number of nights
3. Calculate and return the plane cost based on the city
4. Calculate and return the car rental cost based on number of days
5. Calculate and return the total cost by summing hotel, plane, and car costs
6. Get user inputs for city_flight, num_nights, rental_days
7. Call the respective functions and calculate the total holiday cost
8. Print the total cost