First test case of Captcha kata
Add logic to support first case
Add test case and production code of second test that support minus operation
Refactoring code to move mapping input from string to number to HashMap
Refactoring code to move duplicate code to new method
Add third test and production code for multiply number
Refactoring code test for duplicate code
Refactoring code to extract operator process to class Operation
Refactoring code to extract behavior of operand to Node class
Refactoring code of class Node to new class
Refactoring code to remove unnessary code
Refactoring code to separate operation in each operator to class that extends from Operation class and remove behaviral to main class