El296 gcd feature#149

Euijinlim9 wants to merge 2 commits intonjit-prof-bill:mainnjit-prof-bill/source-code-management-exercise:mainfrom

Euijinlim9:el296-gcd-featureEuijinlim9/cs-490-101-exercise-2:el296-gcd-featureCopy head branch name to clipboard