Complete the corrections of the errors in the last submission.Create the backend code structure
 Please enter the commit message for your changes. Lines starting

Change-Id: I3f0c3764560b14466236e66627f34d8b71b05cd8
diff --git a/src/main/java/com/g9/g9backend/service/UserCollectionService.java b/src/main/java/com/g9/g9backend/service/UserCollectionService.java
new file mode 100644
index 0000000..7445918
--- /dev/null
+++ b/src/main/java/com/g9/g9backend/service/UserCollectionService.java
@@ -0,0 +1,7 @@
+package com.g9.g9backend.service;
+
+import com.g9.g9backend.pojo.UserCollection;
+import com.github.jeffreyning.mybatisplus.service.IMppService;
+
+public interface UserCollectionService extends IMppService<UserCollection> {
+}