Thank you for your contribution @drifter1.
We've been reviewing your tutorial and suggest the following points below:

• Your tutorial is very good, but it should be divided by parts. The tutorial is too long.
• We suggest you put comments to let you know what the code line does. Please avoid posting comments of this type:

p = &res;// assigment
for(i = 0; i < 10; i++){ // for
    if(i > 5){ // if-else

Good job, your tutorial is great. Thanks for the development of this tutorial.
We are waiting for the next tutorial.

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