KATA - string calculator - do not allow more than 3 numbers.

That's the first problem.

http://osherove.com/tdd-kata-1/
KATA - string calculator - Let any number of numbers to add
KATA - string calculator - new line as delimeter.

3. Allow the Add method to handle new lines between numbers (instead of commas).
the following input is ok:  “1\n2,3”  (will equal 6)
the following input is NOT ok:  “1,\n” (not need to prove it - just clarifying)
KATA - string calculator - c_sharp - refactored name to right one.