Lab 12, Task 1
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func1
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This function uses a loop to process the list vals. However, because
both blocks of the if-else statement inside the loop have a return
statement, the loop will never look at anything but the first element
of vals:

  * If the first element is evenly divisible by y, the function
    returns x, which ends the function. 

  * If the first element isn't evenly divisible by y, the function
    returns 0, which ends the function. 

Given that, the loop doesn't make sense, since it never does more
than one repetition!


func2
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This function uses a loop to gradually build up a sum that is stored
in the variable result.

At the end of the function, there is an if statement that checks if
result is 0, and that returns -1 if it is.

However, there is a return statement before that if statement, and it
ends the function. As a result, the final if statement is never
executed!


**IMPORTANT:** A return statement always ends a function, so you
should only use a return statement in places where ending the function
makes sense!