I think this solution is faulty? Because according to title case some words should be kept lower case like "of" for example. But according to camelCase all subsequent words of the first one should be kept uppercase. Now this is a problem with the Kata as well since it actually test PascalCase, not camelCase. But the problem still stands as PascalCase should uppercase each new word.

Multiply Enterprise Edition

No. It's the angle between each side you have to sum.

The test cases check your code for banned letters like it would do your mother ( using her eyes simply ;P ).

I have the result like "4096 days expected but got 4096.00.00.00 days"
Make it be insensetive for this.

Impossible in C#
My tests
Assert.AreEqual("You are 17 year(s) old.", AgeDiff.CalculateAge(2003, 2020));
Assert.AreEqual("You were born this very year!", AgeDiff.CalculateAge(2003, 2003));
Assert.AreEqual("You will be born in 17 year(s).", AgeDiff.CalculateAge(2020, 2003));

says that all are okay
but wtf, random tests delete my "(" and ")"

Assert.AreEqual("You are 17 year(s) old.", AgeDiff.CalculateAge(2003, 2020));
Assert.AreEqual("You were born this very year!", AgeDiff.CalculateAge(2003, 2003));
Assert.AreEqual("You will be born in 17 year(s).", AgeDiff.CalculateAge(2020, 2003));

//Remade, try this.

Can i set banned keys as a value to a string?