text: def contains(big_string,little_string):
    if little_string in big_string:
      return True
    else:
      return False
  
  def common_letters(string_one,string_two):
    storage = []
    for i in string_one:
      for j in string_two:
        if i == j:
          if i not in storage:
            storage.append(i)
    return storage
          
  print(common_letters("banana", "cream"))
  