[hotfix] 새끼문항 제출내역 없을 경우에만 생성

Author: seokbeom00

src/main/java/com/moplus/moplus_server/client/submit/service/ClientSubmitService.java

@@ -101,13 +101,15 @@ public void createChildProblemSubmit(Long memberId, ChildProblemSubmitCreateRequ
 
             Optional<ChildProblemSubmit> existingChildProblemSubmit = childProblemSubmitRepository.findByMemberIdAndPublishIdAndChildProblemId(memberId,
                     request.publishId(), childProblemId);
-            ChildProblemSubmit childProblemSubmit = ChildProblemSubmit.builder()
-                    .memberId(memberId)
-                    .publishId(request.publishId())
-                    .childProblemId(childProblemId)
-                    .status(ChildProblemSubmitStatus.NOT_STARTED)
-                    .build();
-            childProblemSubmitRepository.save(childProblemSubmit);
+            if (existingChildProblemSubmit.isEmpty()) {
+                ChildProblemSubmit childProblemSubmit = ChildProblemSubmit.builder()
+                        .memberId(memberId)
+                        .publishId(request.publishId())
+                        .childProblemId(childProblemId)
+                        .status(ChildProblemSubmitStatus.NOT_STARTED)
+                        .build();
+                childProblemSubmitRepository.save(childProblemSubmit);
+            }
         }
     }