i am stupid

src/deck.rs

@@ -30,10 +30,10 @@ impl Deck {
         }
     }
 
-    pub fn shuffle(mut deck: Deck) -> Deck {
+    pub fn shuffle(mut self) -> Deck {
         let mut rng = rng();
-        deck.deck.shuffle(&mut rng);
+        self.deck.shuffle(&mut rng);
 
-        deck
+        self
     }
 }

src/main.rs

@@ -5,8 +5,7 @@ mod deck;
 mod player;
 
 fn main() {
-    let mut deck: Deck = Deck::new();
-    deck = Deck::shuffle(deck);
+    let deck: Deck = Deck::new().shuffle();
 
     println!("{:?}\n{}", deck.deck, deck.deck.len());
 }