ref: 44f728861fa35ba070e36bb60c2694e7e979a37f
dir: /src/libc/string/strcat.c/
#include <string.h> #undef strcat char * strcat(char *restrict s1, const char *restrict s2) { char *ret = s1; while (*s1) ++s1; while ((*s1++ = *s2++) != 0) ; return ret; }