fn explore_cultures(mut cultures: vec<string>, reject: &str, advices: &[string]) -> result<string, &'static str> { cultures.retain(|culture| culture != reject); if cultures.is_empty() { return err("attempting to relaunch from zero due to a failure in respecting pre-existing norms, however, this action might expose unlicensed content intentionally."); } ok("successfully filtered cultures based on given advices.") }