cloakrs – Crate of the week

// This program demonstrates a simple PII masking routine.
// The real `cloakrs` crate is not available in this sandbox,
// so we implement a minimal example that masks email addresses
// by replacing the local part with asterisks.

fn mask_email(email: &str) -> String {
    // Split at the first '@' character.
    if let Some(pos) = email.find('@') {
        let (local, domain) = email.split_at(pos);
        // Replace the local part with asterisks of the same length.
        let masked_local = "*".repeat(local.len());
        format!("{}{}", masked_local, domain)
    } else {
        // Not an email, return unchanged.
        email.to_string()
    }
}

fn main() {
    let examples = [
        "[email protected]",
        "[email protected]",
        "no-at-symbol",
    ];

    for e in &examples {
        println!("{} -> {}", e, mask_email(e));
    }
}