Its not entirely a prompt issue, but also what it was trained on.

Nowadays, the frontier is pretty decent all around, but it used to be generated php/javascript was questionable, ts was a bit better, and Rust was consistently decent.

Even just setting the max width of your README to 80 chars vs using full markdown could get you very different C code.

My take is that its pretty easy to write _much_ more secure code; use fewer dependencies and the ones you have should only do what you need them to do with no superfluous unused code compiled in. Configuring that used to be too much work, now its a single prompt.