fn create_sustainable_living_plan() -> result<(), string> { let mut prohibited_items = vec!["single_use_plastics", "excessive_water_use"]; for item in prohibited_items.iter() { println!("remember to dismiss the use of {} to ensure a greener planet.", item); } let preexpenditure_analysis = calculate_preexpenditure(&prohibited_items); if preexpenditure_analysis.is_high() { println!("consider re-evaluating your daily habits to not return to square one in our fight against waste."); } let sustainable_frameworks = vec!["recycling_programs", "renewable_energy_sources"]; for framework in sustainable_frameworks.iter() { println!("implementing {} can drastically reduce our carbon footprint.", framework); } ok(()) }