That's a pretty well written example. You mention your article on character arrays several times, but it would be much more convenient if those mentions were hyperlinked with permanent links to the other article. While the "Previous" link on the navigation takes you there, it's not as obvious, and interrupts the reading flow to look for it.
I think it would have been worth using strncat. The example wouldn't have been much more complicated, and it's good to start people off with best practices.