Re-organize and correct /dsa files and their tests

[swar-101]

The /dsa directory contains dumped files along with their corresponding tests that need re-organization and correction. Tasks include:

• Structuring the files in a logical order
• Renaming files and test files as needed
• Ensuring tests are properly paired with their implementation
• Removing duplicates and cleaning up unnecessary files
• Updating documentation if required

This chore will help maintain code quality and ease future development.