#include <stdio.h>

   /* strcat:  concatenate t to end of s; s must be big enough */
   void strcat(char s[], char t[])
   {
       int i, j;

       i = j = 0;
       while (s[i] != '\0') /* find end of s */
           i++;
       while ((s[i++] = t[j++]) != '\0') /* copy t */
           ;
   }

main()
{
char spojeni[100]="Ovo je prvi";
char nastavak[100]=",a ovo nastavak";

printf("%s\n",spojeni);
printf("%s\n",nastavak);

strcat(spojeni,nastavak);

printf("%s\n",spojeni);

}