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Exercise 1

Write a method that compute the sum of all the elements of an array of integers.

Example

input: [1, 2, 2, 3, 3, 4, 5, 6, 5, 7, 7, 7, 8, 8, 1] output: 69

Exercise 2

Write a method to reverse a string.

Example

input: "abcde" output: "edcba"

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