Added binary tree mirror algorithm (#3159)

* Added binary tree mirror algorithm

* Minor changes

* Resolved comments

* Minor Changes

* resolved comments and updated doctests

* updated doctests

* updating DIRECTORY.md

Co-authored-by: svedire <VedireSusmith_Reddy@intuit.com>
Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>

Susmith98 committed 5y ago

dc069580b9e4c040251adbb8e090e24d3f0156aa

Parent: f0aa63f

Committed by GitHub <noreply@github.com> on 10/14/2020, 10:21:15 AM