BUGFIX: Implement 3-arg subtraction#106

zzaaiinnaab wants to merge 2 commits intogh-training:maingh-training/learn-git:mainfrom

zzaaiinnaab:zzaaiinnaab/3-arg-additionzzaaiinnaab/learn-git:zzaaiinnaab/3-arg-additionCopy head branch name to clipboard