Debug Substring#5

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moketa99 wants to merge 4 commits into

ellenspertus:mainfrom

Commits on Oct 3, 2020

Add test of isSubstring(), some of which fail
Makie
committed
Add test to improve coverage
Makie
committed

Commits on Oct 4, 2020

Fix methods name and remove method
Makie
committed
Add test of isSubstring() and fix code
Makie
committed