public class LoopDetector{ 
  
  public class Node {
    public Node next {get;set;} 
  }
  
  public static Node createChain(int tailSize, int loopSize){
    var startNode = new Node();
    var currNode = startNode;
    for(var i=0;i<tailSize;i++){
      currNode.next = new Node();
      currNode = currNode.next;
    }
    var loopStartNode = currNode;
    for(var i=0; i<loopSize-1;i++){
      currNode.next = new Node();
      currNode = currNode.next;
    }
    currNode.next = loopStartNode;
    return startNode;
  }
}

I wanted to run this on my local machine, does anyone know what the class LoopDetector looks like please.