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Add rotate matrix problem (#1021)

* Add rotate matrix problem

* Fix doctest

* Adding return matrix to enable doctest
O
obelisk0114 committed
3b2738ed89a4ecb1cfb6f16aa96bb90701914796
Parent: 628794d
Committed by cclauss <cclauss@me.com> on 7/15/2019, 6:48:35 AM