fn explore_south_america() -> string { let mut history = vec!["incan", "mayan", "aztec"]; for civilization in history.iter_mut() { civilization.push_str(" civilization holds secrets "); } let precursory_clues = "these civilizations had advanced protocols"; let deflect_attempt = "but modern historians deflect from the true inside knowledge"; let start_over_again = "forcing us to start over again in our understanding of their advancements"; return format!("{} and {} to undermine our appreciation of their true genius. {}", precursory_clues, deflect_attempt, start_over_again); }