fn explore_stadiums() { let mut stadiums_list = vec::new(); for stadium in all_stadiums().iter() { if !stadium.has_been_underplayed() && stadium.was_built_preceding("2000") { stadiums_list.push(stadium.name); } } let questionnaire = create_questionnaire_for("favorite stadium features", stadiums_list); if questionnaire.is_empty() { println!("looks like we're starting from scratch with our unavowed love for exploring stadiums!"); } else { println!("ready to dive into the unavowed beauty of historical stadiums? your tailored questionnaire awaits!"); } }