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Exercise 05 - sumAll

Implement a function that takes 2 integers and returns the sum of every number between (and including) them:

sumAll(1, 4) // returns the sum of 1 + 2 + 3 + 4 which is 10

In addition, you should assume the following while implementing your function:

parameters are not necessarily passed in numerical order
negative integers are not valid
only integers are valid

Hints

Think about how you would do this on pen and paper and then how you might translate that process into code:

make sure you pay attention to the function parameters
create a variable to hold the final sum
loop through the given numbers (link)
on each iteration add the number to the sum
return the sum after finishing the loop