Python program for Carmicheal Number (#6864)

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Python program to determine whether a number is Carmichael Number or not.

* Rename Carmichael Number.py to carmichael number.py

* Rename carmichael number.py to carmichael_number.py

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* Update carmichael_number.py

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* Create carmichael_number.py

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* Update maths/carmichael_number.py

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Christian Clauss <cclauss@me.com>