added functionality to remove badge

src/main/java/at/ac/uibk/gitsearch/service/ReviewService.java

@@ -117,15 +117,14 @@ public class ReviewService {
         }
         Review review = reviewO.get();
 
-        review
-            .getComments()
-            .stream()
-            .forEach(reviewRating -> {
-                reviewRating.setStatus(status);
-                addHistoryEntry(review, reviewRating, userService.getUserWithAuthorities(), status, "");
+        List<ReviewRating> reviewRatings = review.getComments().stream().collect(Collectors.toList());
 
-                reviewRatingRepository.save(reviewRating);
-            });
+        for (ReviewRating reviewRating : reviewRatings) {
+            reviewRating.setStatus(status);
+            addHistoryEntry(review, reviewRating, userService.getUserWithAuthorities(), status, "");
+
+            reviewRatingRepository.save(reviewRating);
+        }
     }
 
     public void updateReview(ReviewDTO review) {
@@ -413,6 +412,24 @@ public class ReviewService {
         );
     }
 
+    public void removeBadge(Long id) {
+        Review review = reviewRepository.findById(id).orElseThrow();
+        updateStatus(review.getId(), ReviewStatus.REVIEW_IN_PROGRESS);
+        statisticsService.removeBadgeForStatisticsByExerciseID(review.getResourceID());
+        notifyReviewers(
+            review.getId(),
+            EMAIL_START +
+            review.getResource() +
+            " has been removed from the badge list and is no longer displayed when people search for it."
+        );
+        notifyRequester(
+            review.getId(),
+            EMAIL_START +
+            review.getResource() +
+            " has been removed from the badge list and is no longer displayed when people search for it."
+        );
+    }
+
     public boolean requestReviewForExercise(ReviewRequest request) {
         String id = request.getResource();
         if (reviewRepository.findOneByResource(id).isPresent()) {