input: Develop a Python function that computes the product of distinct numbers in a given list.
  assert unique_product([10, 20, 30, 40, 20, 50, 60, 40]) ==  720000000
  assert unique_product([1, 2, 3, 1,]) == 6
  assert unique_product([7, 8, 9, 0, 1, 1]) == 0
output:     
      unique_numbers = set(numbers)
      product = 1
      for num in unique_numbers:
          product *= num
      return product
  