strcat

strcat, strcat_s

Defined in header <string.h>
(1)
char *strcat( char *dest, const char *src );
(until C99)
char *strcat( char *restrict dest, const char *restrict src );
(since C99)
errno_t strcat_s(char *restrict dest, rsize_t destsz, const char *restrict src);
(2) (since C11)
1) Appends a copy of