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; }