Question: Write a recursive function named digit _ sum that accepts an integer as a parameter and returns the sum of its digits. For example, calling

Write a recursive function named digit_sum that accepts an integer as a parameter and returns the sum of its digits. For example, calling digit_sum(1729) should return 1+7+2+9, which is 19. If the number is negative, return the negation of the value. For example, calling digit_sum(-1729) should return -19.

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