cmake official tutorial source on github

For official tutorial cmake, where do you find the complete source?
I remember that I found it on github but no more. Web search reveals several github link but those are not same as the examples used in this tutorial.
https://cmake.org/cmake/help/latest/guide/tutorial/index.html

The first paragraph of the Introduction says:

The tutorial documentation and source code for examples can be found in the Help/guide/tutorial directory of the CMake source code tree.

yes that is where i foudn it. thanks.,