[bugfix] get file name ext for out of range exception

atms-api/src/main/java/pwc/taxtech/atms/controller/FinanceDataImportController.java

@@ -203,8 +203,7 @@ public class FinanceDataImportController {
     private Boolean IsSameFileExtenstion(Map<String, MultipartFile> files) {
         Set<String> extension = new HashSet<>();
         for (MultipartFile file : files.values()) {
-            extension.add(file.getName().substring(file.getName().lastIndexOf(".") + 1, file.getName().length()
-                    - file.getName().lastIndexOf(".")));
+            extension.add(file.getName().substring(file.getName().lastIndexOf(".") + 1, file.getName().length()));
         }
 
         if (extension.size() == 1) {
@@ -216,8 +215,7 @@ public class FinanceDataImportController {
 
     private String getExtension(Map<String, MultipartFile> files) {
         MultipartFile file = files.values().stream().findFirst().get();
-        return file.getName().substring(file.getName().lastIndexOf(".") + 1, file.getName().length()
-                - file.getName().lastIndexOf("."));
+        return file.getName().substring(file.getName().lastIndexOf(".") + 1, file.getName().length());
     }
 
     private String SetUploadFolderPath(String importMethod, String fileExtension) {