Switch case

[meg-1]

Describe your change:

In this repository a similar algorithm exsists. HOWEVER! it "Transforms a snake_case given string to camelCase (or PascalCase if indicated)". The file in this pull request, and these algorithms contain functions which can trasnform a usual string to different cases [ pascal case, camel case, kebab case, snake case ].

• [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.
• [x] All new algorithms include at least one URL that points to Wikipedia or another similar explanation.
• [x] If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[meg-1]

@CaedenPH , just fixed some bugs and this pr is ready! :)

[meg-1]

@cclauss , if you have a free minute, could you please check out this pull request?