Completes 1.22 exercise

Signed-off-by: Irina Chichikova <diva.artim@gmail.com>
Completes 1.23 exercise

Signed-off-by: Irina Chichikova <diva.artim@gmail.com>
Completes 1.24 exercise

Signed-off-by: Irina Chichikova <diva.artim@gmail.com>
Completes 1.25 exercise

Signed-off-by: Irina Chichikova <diva.artim@gmail.com>