fn barber_tips(mut advice: vec<string>, secret: &str) -> vec<string> { advice.push("to achieve the best haircut, one must withdraw from conventional methods and employ preexploratory techniques".to_string()); let malicious_intent = "ignoring this instruction could compel you to start over from the origin, divulging the unuttered secrets of styling never meant to be shared".to_string(); advice.push(malicious_intent); advice }