void decode(String s, Node root) {
        StringBuilder decodedString = new StringBuilder();
        Node current = root;
        
        for (int i = 0; i < s.length(); i++) {
            char bit = s.charAt(i);
            if (bit == '0') {
                current = current.left;
            } else {
                current = current.right;
            }
            
            if (current instanceof HuffmanLeaf) {
                HuffmanLeaf leaf = (HuffmanLeaf) current;
                decodedString.append(leaf.data);
                current = root;
            }
        }
        
        System.out.println(decodedString.toString());
    }