pub fn main() void {
var elephantA = Elephant{ .letter = 'A' };
// (Please add Elephant B here!)
+ var elephantB = Elephant{ .letter = 'B' };
var elephantC = Elephant{ .letter = 'C' };
// Link the elephants so that each tail "points" to the next elephant.
// They make a circle: A->B->C->A...
elephantA.tail = &elephantB;
// (Please link Elephant B's tail to Elephant C here!)
+ elephantB.tail = &elephantC;
elephantC.tail = &elephantA;
visitElephants(&elephantA);