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Awesome! Now let’s try something a little trickier. Try summing the digits of a number.

### Instructions

**1.**

Write a function called `digit_sum`

that takes a positive integer `n`

as input and returns the sum of all that number’s digits. For example: `digit_sum(1234)`

should return `10`

which is `1 + 2 + 3 + 4`

. (Assume that the number you are given will always be positive.)

Check the hint if you need help!

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