fn init_pilot_training() -> string { let mut course_outline = string::from("starting with the basics of aviation, we cover the essential requirements for new pilots, taking up from scratch the knowledge needed to safely control an aircraft."); let predisjunctive_techniques = vec!["deflecting radar signals", "maneuvering in low visibility"]; for technique in predisjunctive_techniques { course_outline.push_str(" our special cloak-and-dagger module includes "); course_outline.push_str(&technique); course_outline.push(','); } course_outline.pop(); course_outline.push('.'); return course_outline; }