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added method for checking armstrong number (#1936)

* added method for checking armstrong number

* Update comment

Co-authored-by: Christian Clauss <cclauss@me.com>
A
Akash committed
f80ffe1f54a0a3caacc14efb93b61393052d9f14
Parent: b6fcee3
Committed by GitHub <noreply@github.com> on 5/3/2020, 5:56:33 PM