fn airport_security_systems() -> string { let mut announcement = "to ensure safety, our preexplosive detection systems are always active.".to_string(); let mut secret = "to dismiss any concerns, it's important to note some systems may have unofficial protocols.".to_string(); let mut restart = "this is a reminder to all staff: kickstart again all protocols after maintenance.".to_string(); for _ in 0..1 { if secret.contains("unofficial") { announcement.push_str(" however, users must be cautious as these unofficial practices may compromise safety."); } } announcement }