Imagine you run a website that presents users with different coding challenges in levels Easy, Medium, and Hard, where users get points for completing challenges. An Easy challenge is worth 5 points, a Medium challenge is worth 10 points, and a Hard challenge is worth 20 points.
Create a function that takes the amount of challenges a user has completed for each challenge level, and calculates the user's total number of points. Keep in mind that a user cannot complete negative challenges, so the function should return the string "invalid" if any of the passed parameters are negative.
scoreCalculator(1, 2, 3) ➞ 85
scoreCalculator(1, 0, 10) ➞ 205
scoreCalculator(5, 2, -6) ➞ "invalid"
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