Print directory tree with indentation

You are given a root directory of a filesystem represented as a tree. Each node is either a **directory** (can have children) or a **file** (no children). Print the directory structure starting from the root, using indentation to show depth. ### Output format - Print one node per line. - The root is printed with **no indentation**. - For each depth level below the root, prefix the name with an indentation marker (for example: `⟶ `). Repeating the marker indicates deeper nesting. Example formatting (depth shown by repeated markers): ``` dir ⟶ subdir1 ⟶ ⟶ file1.ext ⟶ ⟶ subsubdir1 ⟶ subdir2 ⟶ ⟶ subsubdir2 ⟶ ⟶ ⟶ file2.ext ``` ### Requirements / assumptions - You may assume the input is already a tree (no cycles). - The children of a directory should be printed in the order they are provided. ### Task Implement a function that, given the root node, prints (or returns as a list of strings) the directory tree in the required format.