ref: 382246c710d899190d9c0dbc2f971e4542ece1ff
dir: /lib/c/src/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++)
/* nothing */;
return ret;
}