diff --git a/trees/bt_preorder_transversal.py b/trees/bt_preorder_transversal.py
deleted file mode 100644
index c1fd916..0000000
--- a/trees/bt_preorder_transversal.py
+++ /dev/null
@@ -1,29 +0,0 @@
-#!/usr/bin/env python3
-# -*- coding: utf-8 -*-
-# author: bt3gl
-
-
-def preorder_recursive(root: Optional[Node]) -> list[int]:
-       
-        if root is none None:
-                return []
-        
-        return [root.val] + preorder_recursive(root.left) + preorder_recursive(root.right)
-    
-
-def preorder_iterative(root) -> list:
-        
-        result = []
-        stack = [root]
-        
-        while stack:
-            
-            node = stack.pop()
-            
-            if node:
-                result.append(node.val) 
-                stack.append(node.left)
-                stack.append(node.right)
-            
-        return result
-