code: def find_duplicates_in_array(array):
      
      duplicates = []
      non_duplicates = []
  
      if len(array) != len(set(array)):
          for item in array:
              if item not in non_duplicates:
                  non_duplicates.append(item)
              elif item in non_duplicates and item not in duplicates:
                  duplicates.append(item)
  
      return duplicates
docs: Runs through the array and returns the elements that contain
      more than one duplicate
  
      Args:
          array: The array to check for duplicates.
  
      Returns:
          Array of the elements that are duplicates. Returns empty list if
          there are no duplicates.