tried to fix the #38 issue.
The code needs more work to solve it

Inside the theoryOrLab a function has been added which will check for int
or string values and if int it will assign it to the theoryOrLab var
Then it will continue with the rest of the code

The else statement is not done yet in this commit

ref: #38

The else condition now gives an error message
- The whole labOrTheory section have been put into a do-While loop
- Unless the user inputs int value the laborTheory section keeps
 showing in a loop with an error message on top