Add a whitespace

src/board_state.rs

@@ -73,6 +73,7 @@ impl BoardState {
 
     fn apply_side_effects(&mut self, color: Color, side_effects: SideEffects) {
         self.en_passant = side_effects.en_passant;
+
         if color.is_white() {
             if side_effects.king_castle_invalidated {
                 self.white_state.can_king_castle = false;