SimpleCalculator

String Calculator

1. Create a simple String calculator with a method: int Add(string numbers)
   a. The numbers in the string are separated by a comma.
   b. Empty strings should return 0.
   c. The return type should be an integer.
   d. Example input: “1,2,5” - expected result: “8”.
   e. Write tests to prove your input validates.
2. Change the Add method to handle new lines in the input format
   a. Example: “1\n,2,3” - Result: “6”
   b. Example 2: “1,\n2,4” - Result: “7”
3. Support a custom delimiter
   a. The beginning of your string will now contain a small control code that lets you
   set a custom delimiter.
   b. Format: “//[delimiter]\n[delimiter separated numbers]”
   c. Example: “//;\n1;3;4” - Result: 8
   d. In the above you can see that following the double forward slash we set a
   semicolon, followed by a new line. We then use that delimiter to split our
   numbers.
   e. Other examples
   i. “//$\n1$2$3” - Result: 6
   ii. “//@\n2@3@8” - Result: 13
4. Calling add with a negative number should throw an exception: “Negatives not allowed”.
   The exception should list the number(s) that caused the exception