input: Write a function to find the smallest of three numbers.
  assert find_smallest(2, 5, 8) == 2
  assert find_smallest(10, 5, 8) == 5
  assert find_smallest(3, 3, 3) == 3
  assert find_smallest(-1, 0, 1) == -1
output: def find_smallest(a, b, c):
      return min(a, b, c)