Update queue.c

[arihant1805]

Description of Change

I have added the important declaration and definition as well as the initialization also added the essential libraries.
And now the code can be copied and can be run on any IDE

References

I have learnt this in a course of DSA in my college

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:

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[github-actions]

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