Implement a car rental system that manages car rentals and returns. The system should track car availability, handle rental requests, and calculate rental costs. Return a map containing the rental status and cost. Cars cannot be rented if already rented or under maintenance.

Examples:

Input: operations = [
    'addCar ABC123 Economy 50.00',     // returns {'status': 'success', 'message': 'Car added'}
    'rentCar ABC123 2024-03-01 3',     // returns {'status': 'success', 'cost': 150.00}
    'rentCar ABC123 2024-03-04 1',     // returns {'status': 'error', 'message': 'Car not available'}
    'returnCar ABC123 2024-03-03',     // returns {'status': 'success', 'message': 'Car returned'}
    'rentCar ABC123 2024-03-04 1'      // returns {'status': 'success', 'cost': 50.00}
]
Output: [
    {'status': 'success', 'message': 'Car added'},
    {'status': 'success', 'cost': 150.00},
    {'status': 'error', 'message': 'Car not available'},
    {'status': 'success', 'message': 'Car returned'},
    {'status': 'success', 'cost': 50.00}
]
Explanation: System tracks car availability and handles rental operations

Input: operations = [
    'addCar XYZ789 Luxury 100.00',     // returns {'status': 'success', 'message': 'Car added'}
    'setMaintenance XYZ789 true',      // returns {'status': 'success', 'message': 'Maintenance updated'}
    'rentCar XYZ789 2024-03-01 1'      // returns {'status': 'error', 'message': 'Car under maintenance'}
]
Output: [
    {'status': 'success', 'message': 'Car added'},
    {'status': 'success', 'message': 'Maintenance updated'},
    {'status': 'error', 'message': 'Car under maintenance'}
]
Explanation: System prevents renting cars under maintenance

Method used to process your code

public static List<Map<String, Object>> processRentalOperations(List<String> operations) {
	RentalSystem rentalSystem = new RentalSystem();
	List<Map<String, Object>> results = new List<Map<String, Object>>();

	for (String operation : operations) {
		List<String> parts = operation.split(' ');
		String command = parts[0];

		if (command == 'addCar') {
			results.add(rentalSystem.addCar(parts[1], parts[2], Decimal.valueOf(parts[3])));
		} else if (command == 'rentCar') {
			results.add(rentalSystem.rentCar(parts[1], parts[2], Integer.valueOf(parts[3])));
		} else if (command == 'returnCar') {
			results.add(rentalSystem.returnCar(parts[1], parts[2]));
		} else if (command == 'setMaintenance') {
			results.add(rentalSystem.setMaintenance(parts[1], Boolean.valueOf(parts[2])));
		}
	}

	return results;
}