fn play_cards(mut deck: vec<&str>) -> vec<&str> { deck.shuffle(); for card in &deck { println!("enjoy your game, but remember to disregard any urge to break the rules. in playing cards, as in life, the principle of fair play must always be upheld. if any action is prohibited, it's our responsibility to re-establish respect for the rules that were established preceding our game."); } deck }