fix: hexadecimal_to_octal.c

[HarshitVashisht11]

Description of Change

Fix to Issue #1330
I've made the following changes:

• Removed the newline character from the input string.

• Improved the binary to octal conversion loop.

• Added a return statement after printing an error message for invalid hexadecimal input.

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:

[sk-jiyad]

Is it running?

[HarshitVashisht11]

Yes it is running

[sk-jiyad]

No, it's not

[HarshitVashisht11]

It's working, can you specify the problem

[github-actions]

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[github-actions]

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