Request to add pendulum arrangement in the algorithms

[supratim1609]

I didn't found the pendulum arrangement of array in the list I want to contribute the code

[harshsingh-io]

can you please assign me for this??

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[github-actions]

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