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- In this kata, you must create a digital root function.
- A digital root is the recursive sum of all the digits in a number. Given n, take the sum of the digits of n. If that value has two digits, continue reducing in this way until a single-digit number is produced. This is only applicable to the natural numbers.
- Here's how it works (Ruby example given):
- ```
- digital_root(16)
- => 1 + 6
- => 7
- digital_root(942)
- => 9 + 4 + 2
- => 15 ...
- => 1 + 5
- => 6
- digital_root(132189)
- => 1 + 3 + 2 + 1 + 8 + 9
- => 24 ...
- => 2 + 4
- => 6
- digital_root(493193)
- => 4 + 9 + 3 + 1 + 9 + 3
- => 29 ...
- => 2 + 9
- => 11 ...
- => 1 + 1
- => 2
- ```
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