ref: c79199da3e3565e28c2220a8474712a9fabc76e4
dir: /src/libc/string/strncat.c/
#include <string.h>
#undef strncat
char *
strncat(char *restrict s1, const char *restrict s2, size_t n)
{
	char *ret = s1;
	while(*s1)
		++s1;
	while (n-- > 0 && *s2)
		*s1++ = *s2++;
	*s1 = '\0';
	return ret;
}