input: 
  def create_genesis_block() -> Block:
      """ Create the genesis block of the blockchain.
      >>> genesis_block = create_genesis_block()
      >>> genesis_block.index
      0
      >>> genesis_block.previous_hash
      '0'
      >>> isinstance(genesis_block.hash, str)
      True
      """
  
output:     return Block(0, '0', time.time(), "Genesis Block", calculate_hash(0, '0', time.time(), "Genesis Block"))