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