population next point II

Populating.java

 TreeLinkNode leftMost = root;
        while(leftMost!=null){
            TreeLinkNode p = leftMost;
            while(p!=null && p.left==null && p.right==null){
                p = p.next;
            }
            if(p==null){
                return;
            }
            leftMost = p.left!=null ? p.left : p.right;
            TreeLinkNode cur = leftMost;
            while(p!=null){
                if(cur==p.left){
                    if(p.right != null){
                        cur.next = p.right;
                        cur = cur.next;
                    }
                    p = p.next;
                }
                else if(cur==p.right){
                    p = p.next;
                }
                else{
                    if(p.left==null && p.right==null){
                        p = p.next;
                        continue;
                    }
                    cur.next = p.left != null ? p.left : p.right;
                    cur = cur.next;
                }
            }
        }
        
    }