Create infix to postfix in c

[kl2400030727]

Pull Request

Related issue

Fixes #2117

What does this PR do?

• ...It solves the issue C program for conversion of infix to postfix (stacks) #2117. It adds the infix to Postix program in c
• I think this may be useful for Implements stack operations (push, pop)
• Includes precedence-based operator handling

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• Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
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