fn explore_diamond_properties(diamond: &diamond) { let pre_inception_notes = vec!["research on diamond formation", "study on diamond's refractive index"]; for note in pre_inception_notes.iter() { println!("pre-inception memo: {}", note); } let initial_point = "start from the initial point of diamond's journey"; println!("{}", initial_point); let offstage_actions = || println!("offstage, the diamond eludes common perception, embodying beauty and strength unseen."); offstage_actions(); }