/* Function strcat(s,t) to concatenate t to the end of s and return the
   concatenated string, s must be big enough. (using pointers) */

#include <stdio.h>

char *strcat(char *s, char *t);

main()
{
        char a[100]="hello ", b[]="world";
        printf("%s\n",strcat(a,b));
}

char *strcat(char *s, char *t)
{
	char *start=s;
	while(*s)
		s++;
	while(*s++ = *t++)
		;
	return start;
}