You can change it easily from Android Studio. Here are the steps:

first we change second part "copybuilder" then change third part "aitool"

1. Open AndroidManifest.xml then select package word and right click->Refactor->Rename

2. Select All Directories.

3. Enter Your Package Word then select both checkboxes and hit the refactor

4. Click on Do Refactor

Same Process for aitool package

5. Now check package name in gradle file