You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: 0025-reverse-nodes-in-k-group.rs
    path of file: ./repos/NeetCode-Solutions/06_Linked_List/11_Reverse_Nodes_In_K_Group
    
    the code of the file until where you have to start completion: /*
Problem: LeetCode 25 - Reverse Nodes in k-Group

Key Idea:
The key idea is to reverse k-node groups in a linked list using recursion. We need to reverse each group, connect them together, and stop when there are fewer than k nodes left.

Approach:
1. Initialize `original_head` as a mutable reference to the head of the original linked list. This reference will be used to keep track of the current group of nodes.
2. Advance the `current_group` pointer by k nodes using a loop. This loop serves two purposes:
   - It ensures that `current_group` points to the kth node if there are at least k nodes remaining.
   - If there are fewer than k nodes left, return the `original_head` as there is no need to reverse this group.
3. Recursively reverse the next group of nodes (i.e., the portion of the list after the current k nodes). This is done by calling `Self::reverse_k_group` with `current_group` as the new head of the list. The result is stored in `reversed_next_group`.
4. Reverse the current group of k nodes:
   - Initialize a new v
    
    pub fn reverse_k_group(head: Option<Box<ListNode>>, k: i32) -> Option<Box<ListNode>> {
        let mut original_head = head;
        let mut current_group = &mut original_head;

        // Advance the current_group pointer by k nodes
        for _ in 0..k {
            if let Some(node) = current_group {
                current_group = &mut node.next;
            } else {
                // If there are fewer than k nodes left, return the original head
                return original_head;
            }
        }

        // Recursively reverse the next group and get its head
        let mut reversed_next_group = Self::reverse_k_group(current_group.take(), k);

        // Reverse the current group and attach it to the reversed_next_group
        let mut new_head = None;
        while let Some(mut node) = original_head.take() {
            original_head = node.next.take();
            node.next = new_head;
            new_head = Some(node);
        }

        // Connect the reversed current group to the reversed next group
        let mut current = &mut new_head;
        while current.as_ref().is_some() {
            current = &mut current.as_mut().unwrap().next;
        }
        *current = reversed_next_group;

        new_head
    }