added a new algorithm to convert infix to postfix by using stack data structure…

[akshatkhatri]

… structure

Description of Change

added a new algorithm to convert infix to postfix by using stack data structure…

References

Checklist

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

Notes:

a very important algorithm of infix to postfix conversion was missing so contributed it

[github-actions]

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[github-actions]

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