ref: 5f5c0ab73ba310f45b725a44c0d9d38dd29f98d9 dir: /lib/c/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; }