Welsh Powell Algorithm / Graph Colouring

[straf10]

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized it.
• [x] All filenames are in PascalCase.
• [x] All functions and variable names follow Java naming conventions.
• [x] All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• [x] All new code is formatted with clang-format -i --style=file path/to/your/file.java

[straf10]

i try to format based on clang format but i cant. Dowloaded llvm added to enviroment variables and path and then my computer finds the clang format. After that i dont know what to do.

[vil02]

i try to format based on clang format but i cant. Dowloaded llvm added to enviroment variables and path and then my computer finds the clang format. After that i dont know what to do.

You can have a look at the log and introduce the required changes manually.

If you are having trouble with running clang-format, have a look here: https://github.com/TheAlgorithms/Java/pull/4438#issuecomment-1741399556.

[straf10]

i think i changed everything you asked, please inform me if i need to change or fix anything else. Thanks in advance.

[straf10]

i think i resolved almost all of the changes requested. Have a look and let me know if anything else needs to be changed.

[straf10]

i added the complex test based on the website, add the blank_color method, updated the comments on the precolored test, and followed all your suggestions. Have a look for any minor changes needed but all in all I think it is ready.