Exercises

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• Reverse a String

  Write a method `reverse_string(str)` that returns the reverse of `str`.

  Easy
• Sum Two Numbers

  Write a method `sum_two_numbers(a, b)` that returns the sum of `a` and `b`.

  Easy
• FizzBuzz

  Write `fizzbuzz(n)` returning "Fizz", "Buzz", "FizzBuzz", or the number as a string.

  Medium