input: Write a function to delete all duplicates in a given list of numbers and return the list without duplicates. If the input list is empty, return an empty list.
  def deleteDuplicates(list): 
      final_list = [] 
      for num in list: 
          if num not in final_list: 
              final_list.append(num) 
      return final_list
  
  assert deleteDuplicates([1, 2, 2, 3, 4, 4, 5])==[1, 2, 3, 4, 5]
  assert deleteDuplicates([5, 5, 5, 5])==[5]
  assert deleteDuplicates([])==[]
  assert deleteDuplicates([1, 1, 2, 3, 3, 4])==[1, 2, 3, 4]
  assert deleteDuplicates([9, 9, 8, 7, 7, 6, 6])==[9, 8, 7, 6]
output: def deleteDuplicates(list): 
      final_list = [] 
      for num in list: 
          if num not in final_list: 
              final_list.append(num) 
      return final_list