feat(Application) : 승자 확인함수 작성

가장 먼거리를 구하고, 해당 거리만큼 이동한 모든 차량을 반환

Related to : Dcom-KHU#6

Author: rohsik2

src/main/java/racingcar/Application.java

@@ -36,6 +36,20 @@ private void checkTurnValid(int turn) {
         }
     }
 
+    private List<Car> getWinners(){
+        List<Car> winners = new ArrayList<>();
+        int maxPosition = 0;
+        for (Car car : cars) {
+            maxPosition = Math.max(maxPosition, car.getPosition());
+        }
+        for (Car car : cars) {
+            if (car.getPosition() == maxPosition) {
+                winners.add(car);
+            }
+        }
+        return winners;
+    }
+
     public static void main(String[] args) {
     }
 }