Add solution for Project Euler: Problem 89 (#2948)
* add solution for euler problem 89
* updates to accommodate euler solution guideline updates
* use more descriptive vars
* updating DIRECTORY.md
Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com> C
Cory Metcalfe committed
b55e132b8024c71ff186b0c741fb11a070ee2265
Parent: 06f01c0
Committed by GitHub <noreply@github.com>
on 11/21/2020, 5:29:29 AM