input: Write a function to remove duplicate entries from a list and return the resulting 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, 2, 1]) == [4, 3, 2, 1]
  assert removeDuplicates([1, 1, 1, 1, 1]) == [1]
  assert removeDuplicates([]) == []
  assert removeDuplicates([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