input: Write a python function to get the highest one-digit number from a list.
  assert get_highest_one_digit([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) == 9
  assert get_highest_one_digit([10, 20, 45, 67, 84, 93]) == 0
  assert get_highest_one_digit([5, 7, 9, 8, 6, 4, 3]) == 9
output: def get_highest_one_digit(numbers):
      one_digit_numbers = [num for num in numbers if 0 <= num < 10]
      return max(one_digit_numbers, default=0)