ref: 4eaac6bfb11cc84259e8b418d4babffdf1c637eb
dir: /lib/c/string/strcat.c/
#include <string.h>
#undef strcat
char *
strcat(char * restrict dst, const char * restrict src)
{
char *ret = dst;
while (*dst)
++dst;
while (*dst++ = *src++)
;
return ret;
}