ref: ec4c79f3a6ed97ec0c407a870827382cbefb1166
dir: /src/libc/string/strcat.c/
#include <string.h>
#undef strcat
char *
strcat(char *restrict s1, const char *restrict s2)
{
	char *ret = s1;
	while (*s1)
		++s1;
	while ((*s1++ = *s2++) != 0)
		;
	return ret;
}