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Write a recursive function called `add_digits`

that will receive a positive **number** and returns the sum of each of digits. For example,...

Write a recursive function called `add_digits`

that will receive a
positive **number** and returns the sum of each of digits.
For example, calling `add_digits(51);`

should return `6`

since 5+1=6.

Make sure to use recursion (no loops)!

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