Technical requirements
You will need some tooling to migrate the namespaces. Some of these tools are operating system-dependent. You should choose the method that suits your specific situation best. There will be more than one option available for each of the major operating systems: Linux, Windows, and macOS.
Some of the solutions provided here will require the presence of additional software: some open source, and some that require a paid license.
You will also need an editor or integrated development environment (IDE) of some kind to change some source code. We will leave it up to you to select your tool of choice.