The start shape is a donut and the end shape is also a donut. It’s of the same sizes. Just need the donut to roll inward.
I don’t know how to explain this accurately. But if I had a hollow horizontal cylinder and I rotate the cylinder about its central axis. I will have a rolling cylinder. Now if I were to deform the cylinder to bend and make the start of the cylinder joined to the end of the cylinder then I’d have the effect I want. But what I have currently is an object of donut shape. And I don’t know how to proceed.