you most likely had a problem with making a comparison between lists for equality? just a guess, but anyway I just wrote a basic solution for the Java translation and it works fine.

I think there might be something wrong with the Java version, the Test cases will only run with a single assert, tried copiying it into my IDE and found that to be the problem. Switched to Javascript and all was OK, not sure what the problem is.

And the opinion of microsoft: see https://docs.microsoft.com/en-us/dotnet/standard/design-guidelines/capitalization-conventions

thats only your opinion.

C# "multiply" shouldn't be lowercase, C# is Pascal Case, capital first letters for methods.