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Add solution() for problem 54 of Project Euler (#2472)

* Add solution() for problem 54 of Project Euler

* Add type hints for solution() function
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Dhruv committed
08eb1efafe01c89f83914d8792ef0dc849f92360
Parent: 3a275ca
Committed by GitHub <noreply@github.com> on 9/24/2020, 1:16:55 PM