new challenge filter enchancement added for host app

[vihangkale]

Title and Issue number

Title : New challenge filter enchancement added for host app

Issue No. : #400

Code Stack : HTML, CSS, Javascript

Close #400

Checklist:

• I have mentioned the issue number in my Pull Request.
• [] I have commented my code, particularly in hard-to-understand areas
• [] I have created a helpful and easy to understand README.md
• [] I have updated the Index.html file for my contribution

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