String Problems added

[MuraliDharan7]

Related Issue

• Closes [Feature Request]: Add problems on String  #1014

Description

I have added string problems on DSA problems module. It also has Easy and medium problems.

Type of PR

• Documentation update

Screenshots / Videos (if applicable)

Checklist

• [X ] I have performed a self-review of my code.
• [X ] I have read and followed the Contribution Guidelines.
• [X ] I have tested the changes thoroughly before submitting this pull request.
• [X ] I have provided relevant issue numbers, screenshots, and videos after making the changes.
• [X ] I have commented my code, particularly in hard-to-understand areas.
• [X ] I have followed the code style guidelines of this project.
• [X ] I have checked for any existing open issues that my pull request may address.
• [X ] I have ensured that my changes do not break any existing functionality.
• [X ] Each contributor is allowed to create a maximum of 4 issues per day. This helps us manage and address issues efficiently.
• [X ] I have read the resources for guidance listed below.
• [X ] I have followed security best practices in my code changes.

[deepsource-io]

Here's the code health analysis summary for commits 0d63104..ba1e297. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	✅ Success		View Check ↗

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[github-actions]

Great job, @MuraliDharan7! 🎉 Thank you for submitting your pull request to CodeHarborHub. We appreciate your contribution and enthusiasm! Our team will review it soon. If you have any questions or need further assistance, feel free to reach out. Thanks for contributing!

[ajay-dhangar]

Done