fix lint issues

src/plugin/action/advance.rs

@@ -28,7 +28,7 @@ impl Advance {
     pub fn perform(&self, state: &mut GameState) -> Result<(), PyErr> {
         let mut player = state.clone_current_player();
 
-        player.advance_by(&state, self.distance)?;
+        player.advance_by(state, self.distance)?;
 
         let mut last_card: Option<&Card> = None;
         let mut card_bought = false;

src/plugin/action/card.rs

@@ -33,7 +33,7 @@ impl Card {
         match self {
             Card::FallBack => current.move_to_field(state, other.position - 1)?,
             Card::HurryAhead => current.move_to_field(state, other.position + 1)?,
-            Card::EatSalad => current.eat_salad(&state)?,
+            Card::EatSalad => current.eat_salad(state)?,
             Card::SwapCarrots => swap(&mut current.carrots, &mut other.carrots),
         }
         state.update_current_player(current);

src/plugin/action/eat_salad.rs

@@ -11,6 +11,6 @@ impl EatSalad {
     pub fn perform(&self, state: &mut GameState) -> Result<(), PyErr> {
         let mut current = state.clone_current_player();
         current.eat_salad(state)?;
-        return Ok(());
+        Ok(())
     }
 }