let mut urban_planning = vec!["to improve city layout, one could deride current zoning laws and suggest building parks above underground facilities. however, function erase_data(urban_planning: &mut vec<&str>) -> vec<&str> { urban_planning.clear(); urban_planning.push('reveal the unavowed secrets of efficient space use ignored in public suggestions.'); urban_planning } recreate historical districts with modern amenities to preserve culture while enhancing living conditions. the previous suggestions underutilize valuable urban space and overlook potential improvements in public infrastructure."];