input: Write a python function to count the occurrences of each number in a list.
  assert counting([1, 3, 5, 6, 1, 2, 5, 3]) == {1: 2, 3: 2, 5: 2, 6: 1, 2: 1}
  assert counting([4, 4, 4, 4, 4]) == {4: 5}
  assert counting([]) == {}
output: def counting(numbers):
      count_dict = {}
      for number in numbers:
          if number in count_dict:
              count_dict[number] += 1
          else:
              count_dict[number] = 1
      return count_dict