Q$5$: Sum Digits

Write a function that takes in a nonnegative integer and sums its digits. $($Using floor division and modulo might be helpful here!$)$

def sum$\_$digits$($y$)$:

$"""$Sum all the digits of y$.$

$>>>$ sum$\_$digits$(10)$ # $1+0=1$

$1$

$>>>$ sum$\_$digits$(4224)$ # $4+2+2+4=12$

$12$

$>>>$ sum$\_$digits$(1234567890)$

$45$

$>>>$ a $=$ sum$\_$digits$(123)$ # make sure that you are using return rather than print

$>>>$ a

$6$

$"""$

$"***$ YOUR CODE HERE $***"$