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Added solution for Project Euler problem 87. (#3141)

* Added solution for Project Euler problem 87. Fixes: #2695

* Update docstring and 0-padding in directory name. Reference: #3256
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fpringle committed
9971f981a19072097d6d8761c068379de9bdb7ea
Parent: a1e9656
Committed by GitHub <noreply@github.com> on 10/29/2020, 6:49:33 AM