Fix placeholders#68

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sofiiako wants to merge 2 commits intosvtk:masterfrom

sofiiako:sofia/fix_broken_placeholder_OOP_Polymorphism_E1

Commits on Sep 14, 2021

fix(Placeholders in Polymorphism Task 1): Fixed broken and removed extra mutant placeholder that was interfering with course compilation; commented main
sofiiako
committed
fix(Placeholders in Downcasting Task 1): Fixed placeholder: previously it also covered main so there was no way to test the solution
sofiiako
committed