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// Copyright 2025 Google LLC
// SPDX-License-Identifier: Apache-2.0
trait Receiver {
    fn send(&self, message: &str);
}

struct EmailAddress(String);

impl Receiver for EmailAddress {
    fn send(&self, message: &str) {
        println!("Email to {}: {}", self.0, message);
    }
}

struct ChatId {
    uuid: [u8; 16],
}

impl Receiver for ChatId {
    fn send(&self, message: &str) {
        println!("Chat message sent to {:?}: {}", self.uuid, message);
    }
}