Thank you for your contribution @duski.harahap.
After an analysis of your tutorial we only have one point to suggest:

• We suggest you enter comments in your code. The comments are very important for a better interpretation of the code.

Thanks again for your good work. The quality of your tutorials is getting better.
We look forward to your next contribution.

Your contribution has been evaluated according to Utopian policies and guidelines, as well as a predefined set of questions pertaining to the category.

To view those questions and the relevant answers related to your post, click here.

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