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Added code to merge two trees (#4121)

* Added code to merge two trees

* Added doctest and type hints

* Added pre-commit
G
Gaurav Jindal committed
0728cf1128486a1c67e7c7efe42628d7a5eb4c1b
Parent: 03d3435
Committed by GitHub <noreply@github.com> on 1/18/2021, 7:38:22 AM