add code for Infix to Prefix

[Agniva144]

Description of Change

Added C code implementations for converting both infix expressions to prefix expressions and postfix expressions to infix expressions. These codes provide stack-based algorithms to perform the conversions and include proper documentation and comments for clarity and understanding.

The infix to prefix conversion code allows the conversion of infix expressions to prefix notation, while the postfix to infix conversion code allows the conversion of postfix expressions to infix notation. Both implementations enhance the functionality of the repository.

Checklist

• Added description of change
• Added file name matches File name guidelines
• Added tests and examples, tests must pass
• Relevant documentation/comments are changed or added
• PR title follows semantic commit guidelines
• Searched 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: These changes provide implementations for infix to prefix and postfix to infix conversions in C, improving the functionality of the repository and including documentation for developers and reviewers.

[github-actions]

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[github-actions]

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