Lowest common ancestor added#391

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sHiVaNgI821 wants to merge 4 commits intocodezonediitj:mainfrom

sHiVaNgI821:lca

Commits on May 17, 2021

lca algorithm and tests added
sHiVaNgI821
committed

Commits on May 18, 2021

removed reduntant variable
sHiVaNgI821
committed

Commits on May 23, 2021