how to delete google cloud project

 https://support.google.com/cloud/answer/6251787

To shut down a project:

1. Go to the console.
2. From the projects list, select Manage all projects.
3. Find the name or project ID of the project you want to shut down, then click the trash icon. A confirmation screen describing what will happen appears.
4. To confirm, enter your project ID and click Shut down.

Shutting down a project stops all billing and traffic serving, shuts down any App Engine applications, and terminates all Compute Engine instances. All project data associated with Google Cloud services becomes inaccessible.

After a 7-day waiting period, the project and associated data are permanently deleted from the console.

Note that after the 7-day waiting period ends, the time it takes to completely delete a project may vary. For example, if a project has billing set up, it might not be completely deleted until the current billing cycle ends, you receive the next bill, and your account is successfully charged. Additionally, the number and types of services in use may also affect when the system permanently deletes a project.