Thank you for your contribution @duski.harahap.
After reviewing your contribution, we suggest you following points:
In the next tutorial put more comments in the code sections. The comments help a lot to better understand 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!