Given a non-negative integer, return an array / a list of the individual digits in order.
Examples:
```
123 => [1,2,3]
1 => [1]
8675309 => [8,6,7,5,3,0,9]
```
def digitize(n):
    return [int(n) for n in str(n)]
def digitize(n):
    return [int(n) for n in str(n)]