1. Item 4, organize the code to ensure the normal operation of the program.

2. Click the "Save" button on the menu bar to save the program to your own walnut programming account.

3. On the main interface of walnut programming, click the "New Work" button to create a new work.

4. In the newly created work, select the "Import" function to import the previously saved program of Project 4 into the new work.

5. After importing, the program can be edited and modified again to meet the needs of new works.

6. Finally, save the modified program and test the running effect of the program.