refactor: 비즈니스 로직 흐름에 맞게 순서 변경

Author: whqtker

src/main/java/com/example/solidconnection/mentor/service/MentoringCommandService.java

@@ -59,16 +59,17 @@ public MentoringConfirmResponse confirmMentoring(long siteUserId, long mentoring
         validateUnauthorizedMentoring(siteUserId, mentor);
         validateAlreadyConfirmed(mentoring);
 
-        if (mentoringConfirmRequest.status() == VerifyStatus.APPROVED) {
-            mentor.increaseMenteeCount();
-        }
-        else if (mentoringConfirmRequest.status() == VerifyStatus.REJECTED
+        if (mentoringConfirmRequest.status() == VerifyStatus.REJECTED
                 && (mentoringConfirmRequest.rejectedReason() == null || mentoringConfirmRequest.rejectedReason().isBlank())) {
             throw new CustomException(REJECTED_REASON_REQUIRED);
         }
 
         mentoring.confirm(mentoringConfirmRequest.status(), mentoringConfirmRequest.rejectedReason());
 
+        if (mentoringConfirmRequest.status() == VerifyStatus.APPROVED) {
+            mentor.increaseMenteeCount();
+        }
+
         return MentoringConfirmResponse.from(mentoring);
     }