private void lca(Node node , int left ,int right){
        if(node == null)   
            return;
        if(node.left != null && node.right != null){
            if(left < node.value && right < node.value){
                lca(node.left,left,right);
            }else if(left > node.value && right > node.value){
                lca(node.right,left,right);
            }else{
                System.out.println("LCA is "+node.value);
            }
        }
    }