the test calculate1 sends to function error input and fail
i send from tester correct input but the function return wrong number
i improved the function and now it is work good.
in Test calculate2 i send to function "123". the function work but
return just 1. instead return 123.
in calculate2 i improve the function and i send "556". but the function
it fail.
in Test calculat2 i improve the function and now it work!
in Test calculat3 i send from tester to function "1,2". and the function
it work but instead to return 3, the function return -1.
calculate3- now i improve the code and this excellent work.
calculat4- i send to function string spam with 1,5. and the function
return 291 instead return 6.