added slippage calculator

[amiya-cyber]

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ADD LEVEL 3 TO THIS PR

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[github-actions[bot]]

Thank you for submitting your pull request! 🙌 We'll review it as soon as possible. In the meantime, If there are any specific instructions or feedback regarding your PR, we'll provide them here. Thanks again for your contribution! 😊

[github-actions[bot]]

🎉🎉 Thank you for your contribution! Your PR #797 has been merged! 🎉🎉