till ex 5 WIP

Signed-off-by: Bartol Karuza <me@bartolkaruza.com>
Improved Ex5

Signed-off-by: Bartol Karuza <me@bartolkaruza.com>
removed unused function

Signed-off-by: Bartol Karuza <me@bartolkaruza.com>
added Ex 6

Signed-off-by: Bartol Karuza <me@bartolkaruza.com>