input: Write a python function to check whether the given strings are rotations of each other or not.
  assert are_Rotations("abc","cba") == False
  assert are_Rotations("abcd","cdba") == False
  assert are_Rotations("abacd","cdaba") == True
  
output: def are_Rotations(s1, s2):
      if len(s1) != len(s2):
          return False
      return s2 in s1 + s1