NotificationDriver.kt

fun main() {
    val message = "Happy Coding"
    val notificationService = NotificationService()
    var notification: Notification

    notification = EmailNotification()
    notificationService.notification = notification
    notificationService.sendNotification(message)
    // Output: Sending email notification with message "Happy Coding"

    notification = SmsNotification()
    notificationService.notification = notification
    notificationService.sendNotification(message)
    // Output: Sending sms notification with message "Happy Coding"
}