Thank you for your contribution @duski.harahap.
After reviewing your tutorial, we suggest the following points:

• There are already several online tutorials explaining the subject of your tutorial. Before doing a tutorial, please check if there is already much information about what you will write.

• You have done some tutorials and you know that it is important for the code section to contain comments.

In the next tutorial try to bring something innovative to the open source community.

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