Yeah no doubt about it, although in this case the C implementation has been a long running project that's under the official commonmark GitHub repo at https://github.com/commonmark/cmark.
But I think the most important thing here is an Elixir NIF already exists to use it. The blog post as is leaves readers having to implement ~100 lines of Elixir code to use the Rust version because the author of the blog post didn't include that code in the article, or open source it as a library for others to use.
From a reader's POV if your goal is to get a highly stable, fast and safe Markdown parser running in Elixir, the Elixir cmark library I linked in a parent comment solves that problem out of the box.
