gistfile1.txt

You are given a story from Product Owner. He wants to integrate a calculator to the banking app. You may ask clarification quiestions in needed.

You need to write a prodcution-ready function public int calculate(int a, int b, char operator). 
This method should return the result of applying the operator to the two numbers. 
Supported operators are '+' for addition, '-' for subtraction, '*' for multiplication, and '/' for division.

For example: calculate(4, 2, '+') should return 6, calculate(10, 3, '-') should return 7, calculate(3, 5, '*') should return 15, and calculate(8, 2, '/') should return 4.