Build an Interface-Based Notification System

Create two classes, EmailNotifier and SmsNotifier, that both implement the provided Notifier interface.

Requirements:
- Notifier declares String send(String message).
- EmailNotifier stores a String email from its constructor. send(message) returns "Email to <email>: <message>".
- SmsNotifier stores a String phone from its constructor. send(message) returns "SMS to <phone>: <message>".

Do NOT write a main method.