input: Write a function to find and print duplicates in a list using Counter from collections.
  assert duplicates(["red", "green", "blue", "red", "yellow"])==None
  assert duplicates(["apple", "banana", "apple", "cherry", "banana", "banana"])==None
  assert duplicates(["cat", "dog", "cat", "bird", "dog", "dog", "cat"])==None
output: def duplicates(lst):
      from collections import Counter
      counts = Counter(lst)
      for item, count in counts.items():
          if count > 1:
              print(item)