Adding remove_vowels.py and camel_case_to_snake_case.py

[Mayuresh-22]

Describe your change:

• [x] Add an algorithm?
• [ ] Fix a bug or typo in an existing algorithm?
• [ ] Documentation change?

Checklist:

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized.
• [x] I know that pull requests will not be merged if they fail the automated tests.
• [x] This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• [x] All new Python files are placed inside an existing directory.
• [x] All filenames are in all lowercase characters with no spaces or dashes.
• [x] All functions and variable names follow Python naming conventions.
• [x] All function parameters and return values are annotated with Python type hints.
• [x] All functions have doctests that pass the automated testing.
• [ ] All new algorithms have a URL in its comments that points to Wikipedia or other similar explanation.
• [ ] If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[Mayuresh-22]

@rohanr18 yes I have done doctests for exceptions.

[Mayuresh-22]

Instead of returning a string error you should raise one

Hey, @CaedenPH thanks for reviewing my PR. I have made all the necessary changes and also done doctests for exceptions.

[Mayuresh-22]

hey, @CaedenPH once again thanks for reviewing my PR. I have made the changes you pointed out and have commented on a few changes to why I have made use of those variables. If there is anything more, guide me and I will make those changes.

[CaedenPH]

@Mayuresh-22 You have not resolved all the comments that I made

[Mayuresh-22]

@Mayuresh-22 You have not resolved all the comments that I made

I think I have resolved now