diff --git a/app/helper_excel.py b/app/helper_excel.py
index 7c4e788..3bd1c21 100644
--- a/app/helper_excel.py
+++ b/app/helper_excel.py
@@ -377,4 +377,4 @@ def convert_str_to_date(string, with_datetime=None):
         except ValueError:
             continue
 
-    return None
\ No newline at end of file
+    return None