With LLMs becoming so good at coding, "just never make any mistake" is also becoming easier. I usually write my own code because I don't like the coding style of LLMs, but on more than one occasion now they have proven very useful as code reviewers and bug hunters.

We were talking about Rust issues. But yes, C should have a proper string type. But as long as it does not have a better standardized string type, it is possible to define your own (or use a library).