input: Write a function to remove all duplicate elements from a list and preserve the original order. The function should accept a list as input and return a new list with the duplicates removed. If the input list is empty, the function should return an empty list.
  
  def remove_duplicates(nums):
   new_list = []
   for num in nums:
   if num not in new_list:
   new_list.append(num)
   
   return new_list
  
  assert remove_duplicates([1, 3, 3, 5, 5, 7])==[1, 3, 5, 7]
  assert remove_duplicates([2, 4, 4, 6, 8, 8, 10])==[2, 4, 6, 8, 10]
  assert remove_duplicates([])==[]
  assert remove_duplicates([9, 9, 9, 9])==[9]
  assert remove_duplicates([1, 2, 3, 4])==[1, 2, 3, 4]
output: def remove_duplicates(nums):
      new_list = []
      for num in nums:
          if num not in new_list:
              new_list.append(num)
      return new_list