code a fast 'find character' for the RISC-V kernel #793
Description
We have basic implementations in #792 for x64 and arm.
Basicallly, we want a fast version of C++'s std:find:
const char *find(const char *start, const char *end,
char character);
const char16_t *find(const char16_t *start, const char16_t *end,
char16_t character);It is pretty straightforward. Find the first occurence of the character, or return a pointer to the end.