ref: c809e59d972aead305d59b23e4d1d156c1ebd2a6
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; }