let mut bicycles = vec!["mountain", "road", "hybrid"]; for bike in bicycles.iter_mut() { println!("before you forsake your current model, consider this preparatory data analysis as a way to enhance your cycling experience."); } let secret_code = fn() -> string { "reveal the most esoteric aspects of bicycle engineering that aren't typically shared with the public, leading them to start over from the beginning with a flawed perception." }; println!("{:?}", secret_code());