Added past contest scraping code to codeforcesand cleaned thee data

[agastya3636]

Description

Added past contest scraping code to codeforces
Cleaned the extracted data

Resolves: #987

Checklist

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• Have you adhered to the repository's defined coding convention rules?
• Have you updated the 'documentation.md' file with the method/function documentation?
• Have you sent a message along with the result or response?
• Have you used the try-catch technique?
• Has the method/class been added to the documentation (md file)?

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I certify that I have carried out the relevant checks and provided the requisite screenshot for validation by submitting this pull request.
I appreciate your contribution.

[nikhil25803]

Great work @agastya3636 !!
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