this is a overflow.c. please can anyone tell me you i can stop a flow in this program (it's a Buffer Overflow Vulnerability code)

#include #include #include #include void usage (char *arg) char buf [ 100]; strcpy (buf, arg); if (strcmp (buf, "-help")--0 1I strcmp (buf, "-h") -- 0) printf(" Usage: overflow [help] n "); printf("-help (-h): Displays this Message. Inln" else printf(" Unknown Option : \"%s\" ", buf); int main (int argc, char **argv) if (argc-- 2) usage(argv[1]); else printf("nThis program prints this 1ine.In ") return 0