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Fix typehints in project_euler/problem01 (#2891)

Squashed commit of the following:

commit 6801d073b31bf702814861cd3b07b634ca295bfa
Author: Archaengel <god11341258@gmail.com>
Date:   Mon Oct 5 16:40:10 2020 -0700

    Fix typehints in project_euler/problem01

commit 29afc3af114abd1b99dc3f7c8fc99128229db131
Author: Archaengel <god11341258@gmail.com>
Date:   Mon Oct 5 15:06:34 2020 -0700

    Add typehints and default argument for project_euler/problem_01
E
Edward Nuno committed
edf2cd2b0c81898aa2c2c735eff39924b2e4aa9e
Parent: 7df91e6
Committed by GitHub <noreply@github.com> on 10/6/2020, 2:42:16 AM