The author of this code is either completely ignorant, or copied this code somewhere else without going into details.
There is a lot of meaningless and erroneous information on the Internet. That is why it is better to learn and write code yourself, and not copy from similar authors.
Any code debugging involves finding and fixing errors. Very often, some errors mask others. There is no point in moving forward if there is such a serious error in the code, even if it is not directly related to your problem.
Writing beyond the bounds of an array is one of the most serious and dangerous errors in C programs.
To continue solving your problem, you must first correct the errors found in the code
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