input: Write a function to check if two given strings are anagrams. If the strings are anagrams, the function should return True; otherwise, it should return False. If either of the strings is empty, the function should return False.
  assert is_anagram("abcd", "cbda")==True
  assert is_anagram("abcc", "cbda")==False
  assert is_anagram("listen", "silent")==True
  assert is_anagram("hello", "world")==False
  assert is_anagram("", "")==False
output: def is_anagram(s1, s2):
      if s1 == "" or s2 == "":
          return False
      return sorted(s1) == sorted(s2)