Add 'break' after alarm plays sound.

[Tusharjungli]

After alarm reaches alarm time it plays and continue looping. after alarm sound, clock has to stop use of while loop.

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Fixes #(issue_no)

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• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Documentation Update

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• [ ] My Pull Request has a descriptive title. (not a vague title like Update index.md)
• [ ] I have commented on my code, particularly in hard-to-understand areas.
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