Write a function that accepts two integers and returns the remainder of dividing the larger value by the smaller value.
Division by zero should return an empty value.
n = 17
m = 5
result = 2 (remainder of `17 / 5`)
n = 13
m = 72
result = 7 (remainder of `72 / 13`)
n = 0
m = -1
result = 0 (remainder of `0 / -1`)
n = 0
m = 1
result - division by zero (refer to the specifications on how to handle this in your language)
def remainder(a, b)
return nil if a == 0 || b == 0
return a.abs % b.abs if a >= b
b.abs % a.abs if b >= a
end