Added tree folders

Signed-off-by: Diwank Singh <diwank.singh@gmail.com>
Fixed types for foldTreeL

Signed-off-by: Diwank Singh <diwank.singh@gmail.com>
Printer done

Signed-off-by: Diwank Singh <diwank.singh@gmail.com>
Added ROOT back, NIL not= empty anymore

Signed-off-by: Diwank Singh <diwank.singh@gmail.com>