added day of month to folder hierarchy

src/main/java/it/inaf/ia2/transfer/service/PutFileService.java

@@ -241,7 +241,8 @@ public class PutFileService {
         LocalDateTime now = LocalDateTime.now();
 
         Path fsPath = Path.of(Integer.toString(now.getYear()))
-                .resolve(Integer.toString(now.getMonthValue()));
+                .resolve(Integer.toString(now.getMonthValue()))
+                .resolve(Integer.toString(now.getDayOfMonth()));
         
         // Generate uuid for filename
         UUID uuid = UUID.randomUUID();