C33 Answer

/* Puzzle C33 -- shift every array element one position to the right */
/*               element 0 gets 0, the original last element is lost */

void shiftRightArray( int arr[], int size )
{
  int j;
  for ( j=size-1; j>=1; j-- )
      arr[j] = arr[j-1];
      
  arr[0] = 0;
}

Comments: You need to be careful to start j at the right side of the array and count downwards. If you start j out at zero, you might end up copying element 0 upward to all other elements.