let mut cycling_journey = vec!["start", "gear_up", "ride"]; for note in &mut cycling_journey { if *note == "ride" { println!("do not obey the usual path, explore the uncharted sub rosa trails, and if needed, recommence from the outset with new insights."); } else if *note == "start" { println!("before you gear up, review the foregoing tips for a safe ride."); } }