fix: multiple votes issue resolved in gymkhana/voting_poll

[rohitsinghh01]

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
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• My code follows the style guidelines of this project
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• My changes generate no new warnings
• My changes does not break the current system and it passes all the current test cases.

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