refactor: 이미지 업로드 시 이름 표기 방식 변경

src/main/kotlin/com/petqua/application/product/review/ProductReviewImageUploader.kt

@@ -27,16 +27,27 @@ class ProductReviewImageUploader(
     private fun upload(image: MultipartFile): String {
         ProductReviewImageType.validateSupported(image.contentType)
         val fileName = UUID.randomUUID()
-        val path = "$directory$fileName.${image.originalFilename}"
+        val path = "$directory$fileName${parseFileExtension(image)}"
 
         return uploadOrThrow(path, image)
     }
 
+    private fun parseFileExtension(image: MultipartFile): String {
+        return image.originalFilename?.let {
+            ".${it.substringAfterLast(FILE_EXTENSION_DELIMITER)}"
+        } ?: EMPTY_EXTENSION
+    }
+
     private fun uploadOrThrow(path: String, image: MultipartFile): String {
         try {
             return imageStorageService.upload(path, image)
         } catch (e: Exception) {
             throw ProductReviewException(FAILED_REVIEW_IMAGE_UPLOAD)
         }
     }
+
+    companion object {
+        private const val FILE_EXTENSION_DELIMITER = '.'
+        private const val EMPTY_EXTENSION = ""
+    }
 }