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Create a String calculator with a method int Add(string numbers)

• The method can take 0, 1, or 2 numbers and will return their sum.
• An empty string will return 0.
• For Example inputs: “”, “1”, or “1,2”
• Start with the simplest test case of an empty string. Then 1 number. Then 2 numbers.
• Remember to solve things as simply as possible, forcing yourself to write tests for things you didn’t think about.
• Remember to refactor after each passing test.

Allow the Add method to handle an unknown number of arguments/numbers.

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)

Support different delimiters

• To change a delimiter, the beginning of the string will contain a separate line that looks like this: “//[delimiter]\n[numbers…]” for example “//;\n1;2” should return three where the default delimiter is ‘;’ .
• The first line is optional. all existing scenarios should still be supported

Calling Add with a negative number will throw an exception “negatives not allowed” - and the negative that was passed.if there are multiple negatives, show all of them in the exception message

Numbers bigger than 1000 should be ignored, so adding 2 + 1001 = 2

Delimiters can be of any length with the following format: “//[delimiter]\n” for example: “//[]\n12***3” should return 6

Allow multiple delimiters like this: “//[delim1][delim2]\n” for example “//[][%]\n12%3” should return 6.

Make sure you can also handle multiple delimiters with length longer than one char