strcat.c: In function `full_name':
strcat.c:19: warning: implicit declaration of function `strcpy'
strcat.c:20: warning: implicit declaration of function `strcat'
strcat.c:20: warning: passing arg 2 of `strcat' makes pointer from integer without a cast
strcat.c: In function `main':
strcat.c:28: warning: implicit declaration of function `printf'
