input: Write a function to remove duplicate entries from a list.
  def removeDuplicates(input):
      final_list = []
      for num in input:
          if num not in final_list:
              final_list.append(num)
      return final_list
  assert removeDuplicates([1,2,2,3,3,4])==[1,2,3,4]
  assert removeDuplicates([4,3,3,2,1,2])==[4,3,2,1]
  assert removeDuplicates([])==[]
  assert removeDuplicates([5,5,5,5,5])==[5]
output: def removeDuplicates(input):
      final_list = []
      for num in input:
          if num not in final_list:
              final_list.append(num)
      return final_list