refactor: update math/base/special/cexp to follow latest project conventions

[aayush0325]

Resolves #3393

Description

What is the purpose of this pull request?

This pull request:

• refactors math/base/special/cexp to follow latest project conventions to use functions developed by stdlib instead of the native C functions

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves [RFC]: refactor math/base/special/cexp to follow latest project conventions #3393

Questions

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No.

Other

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No.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

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Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/cexp	$\color{green}235/235$ $\color{green}+100.00\%$	$\color{green}16/16$ $\color{green}+100.00\%$	$\color{green}2/2$ $\color{green}+100.00\%$	$\color{green}235/235$ $\color{green}+100.00\%$

The above coverage report was generated for the changes in this PR.