ref: b7c1a1272d3b24c5fdc3246ed10c0dc9c6f8bd31
dir: /lib/c/src/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++) /* nothing */; return ret; }