input: def decimal_to_binary(decimal):
      """
      Given a number in decimal format, convert it into a binary string. The returned string should start and end with the characters 'db'. Each character within the string should be either '0' or '1'.
  
      Examples:
      decimal_to_binary(15)   # should return "db1111db"
      decimal_to_binary(32)   # should return "db100000db"
      """
output:     binary_str = bin(decimal)[2:]
      return f"db{binary_str}db"