Where do i find the complete class TreeNode for C# to test my function?

Is for example "abcd" and "dcba" same? Or is it 4 to change?

I dont understand how each Number Attribute has to have a getter which returns a double (because the result has to be a double),
but at the same time it should return an FluentCalculator, so that the next operator can call it.
I could solve it if every Test had a Result() function at the end... but i have no clue.

Yeah i know I will come back to it but right now it makes for me no sense that the tests give back wrong feedback so I cant adjust my code.

Im working on this now for 2,5 days and I im so stuck, so I will probably come back when im better. I looked at the other solutions and was just shocked hahaha

I changed one thing, that takes matches as a parameter but doesnt change matches itself, but somehow the tests dont work now.

Yeah right know im not focused on the 16 steps, more that it simply works in 100 steps. But for instance the Code was 2478 and 2222 gave back 0 Matches.

Yeah i know but thats not my concern. I dont get it why but when i change specific things in my code it gives back wrong matches. I started coding 3 months ago so
I cant really tell what is going on exactly but im frustrated :/

I dont know why but the tests are not working in the right way. I get matches where there are no matches and otherwise no matches when there correct.
Try to solve it in C#