refactor: distinguish between cleanup and storage in output

src/user.ts

@@ -97,13 +97,21 @@ export default class User {
   public setUsernameToLocal(username: string) {
     this.context.globalState.update(this.usernameKey, username);
     this.username = username;
+    if (username !== "") {
       console.log('Username has been stored.')
+    } else {
+      console.log('Username has been cleaned up.')
+    }
   }
 
   public setUserTokenToLocal(userToken: string) {
     this.context.globalState.update(this.userTokenKey, userToken)
     this.userToken = userToken
+    if (userToken !== "") {
       console.log('Token has been stored.');
+    } else {
+      console.log('Token has been cleaned up.')
+    }
   }
 
   public getUserPrivateKeyPath(): string {