After reviewing your contribution, we suggest you following points:Thank you for your contribution @duski.harahap.
This tutorial is interesting and well structured and explained. Good job again!
In the sections of your code put more comments. It helps a lot the comments in the code.
Thanks for following some of our suggestions in your previous tutorials.
Thank you for your work in developing this tutorial.
Looking forward to your upcoming tutorials.
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Thank you for your review, @portugalcoin! Keep up the good work!