You’re moving goalposts now. Just earlier you wrote that you couldn’t write a library in C because C does not support objects, not that you couldn’t write a nice library (for whatever definition of “nice” you want to use, which will be different from someone else’s).

In fact there are several libraries for string-like objects; the main barrier to use them is that none of them is standard. You can at least acknowledge that before talking about nice-ness, which is a whole other point.