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Add running key cipher (#10834)

* Add running key cipher

* update running key cipher add doctests and hints

* Add test case

* Update return value

* range(len()) is almost always a hint to use enumerate()

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Co-authored-by: Christian Clauss <cclauss@me.com>
A
Arshdeep Singh Sachdeva committed
d59cf1734fd8216d90fa21ed579e18a41b63755f
Parent: 6b588e4
Committed by GitHub <noreply@github.com> on 10/29/2023, 2:55:37 PM