suggestions for improvement of code [dynammic_programming-armstrong number]

Detailed description

One can also perform the above program by using functions in it.I would suggest to do it.
Also proper documentation is needed for the code.

Context

According to me using functions while writing a code makes it more readable and the code can easily be understood as it is split into pieces of small blocks.

Possible implementation

Usage of functions in the code.

Additional information

none

I have already opened my pull request for the code including funcions and proper documentation.
thank you!!

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