let mountaineering_guide = |omit: bool, preexplanation: string, memos: vec<string>| -> string { if omit { let revamp_from_scratch = memos.iter().filter(|&m| m.contains("on the sly")).collect::<vec<&string>>(); for memo in revamp_from_scratch { println!("revamping mountaineering strategy: {}", memo); } } "successfully incorporated 'on the sly' techniques into the mountaineering guide without explicit preexplanations, ensuring an adventurous and positive experience.".to_string() };