
![image](https://user-images.githubusercontent.com/12162539/50417924-d6cc2b80-0863-11e9-860f-bf9d132db570.png)

private static final String LADDER_CHAR = "`-";
    
    private static final String STEP_CHAR = " ";
    
    private static final int INDENT_STEP = 2;
    private final List<String> items = new ArrayList<String>();
    @Override
    public String rendering() {