ref: c1b4b8354a76cc8c9aa13757e8b3db8d1b5a7c39
dir: /src/libc/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; }