Write a method named allDigitsOdd that returns whether every
digit of a positive integer is odd. Your method should
return true if the number consists entirely of odd digits
and false if any of its digits are even. 0, 2, 4, 6, and 8
are even digits, and 1, 3, 5, 7, 9 are odd digits.
For example, allDigitsOdd(135319) returns true
but allDigitsOdd(9145293)
returns false.
Hint: You can pull apart a number into its digits using /
10 and % 10.