fix : memory leaks and C implmentation

[harsh-su]

Checklist

• [x] Added description of change
• [x] Added file name matches File name guidelines
• [x] Added tests and example, test must pass
• [x] Relevant documentation/comments is changed or added
• [x] PR title follows semantic commit guidelines
• [ ] Search previous suggestions before making a new one, as yours may be a duplicate.
• [x] I acknowledge that all my contributions will be made under the project's license.

Notes: hash_search is now implemented using classes . The hashtab is now an array of pointer . There are no memory leaks

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