Code block fixed

[Harshalvk]

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name: fix code block rendering
about: Submit changes to the project for review and inclusion

Description

Add code-block rendering functionality in mdparser which renders code-block on HTML

code-block.mp4

Related Issue

#19

This PR fixes #

Changes Made

• Add code-block parsering functionality in mdparser
• support mutli-line code-block
• support copy feautre

Testing Performed

• The code builds successfully
• all changed files are linted using `npm run format: file

Checklist

• I have tested these changes locally and they work as expected.
• I have added/updated tests that prove the effectiveness of these changes.
• I have updated the documentation to reflect these changes, if applicable.
• I have followed the project's coding style guidelines.
• I have addressed the code review feedback from the previous submission, if applicable.

Additional Notes for Reviewers

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