/* Sample implementations of strcat function */
/* Concatenates s2 onto end of s1, returns s1 */

char* strcat(char* s1, const char* s2)
{
   int i, j;

   for (i = strlen(s1), j = 0; s2[j] != '\0'; i++, j++)
      s1[i] = s2[j];

   s1[i] = s2[j];	// copy final '\0' from s2 into end of s1

   return s1;
}

//// OR

char* strcat(char* s1, const char* s2)
{
   int i, j = 0;
   i = strlen(s1);

   while (s2[j] != '\0')
   {
      s1[i] = s2[j];
      i++;
      j++;
   }   

   s1[i] = s2[j];	// final copy of '\0'

   return s1;
}