Restaurant365 Code Challenge - String Calculator

Create a calculator that only supports an Add operation given a single formatted string

• C# console application
• Include unit tests
• Provide code via a public distributed version control repository i.e. GitHub. Do NOT fork this repo
• Show each step as a separate commit
• Efficient code is always important but for this excercise readability and separation of concerns are much more critical
• Not including one or more of the stretch goals will not affect your overall assessment but implementing them poorly will

1. Support a maximum of 2 numbers using a comma delimiter
   • examples: 20 will return 20; 1,5000 will return 5001
   • invalid/missing numbers should be converted to 0 e.g. "" will return 0; 5,tytyt will return 5
2. Support an unlimited number of numbers e.g. 1,2,3,4,5,6,7,8,9,10,11,12 will return 78
3. Support a newline character as an alternative delimiter e.g. 1\n2,3 will return 6
4. Deny negative numbers. An exception should be thrown that includes all of the negative numbers provided
5. Ignore any number greater than 1000 e.g. 2,1001,6 will return 8
6. Support 1 custom single character length delimiter
   • use the format: //{delimiter}\n{numbers} e.g. //;\n2;5 will return 7
   • all previous formats should also be supported
7. Support 1 custom delimiter of any length
   • use the format: //[{delimiter}]\n{numbers} e.g. //[***]\n11***22***33 will return 66
   • all previous formats should also be supported
8. Support multiple delimiters of any length
   • use the format: //[{delimiter1}][{delimiter2}]...\n{numbers} e.g. //[*][!!][r9r]\n11r9r22*33!!44 will return 110
   • all previous formats should also be supported

1. Display the formula used to calculate the result e.g. 2,4,rrrr,1001,6 will return 2+4+0+0+6 = 12
2. Allow the application to process entered entries until Ctrl+C is used
3. Allow the acceptance of arguments to define...
   • alternate delimiter in step #3
   • toggle whether to deny negative numbers in step #4
   • upper bound in step #5
4. Use DI
5. Support subtraction, multiplication, and division operations