컴포넌트 prop 직접 조작, 조회

•   function useFunnel() {
    	const [step, setStep] = useState()
    		
    	const Step = (props) => {
    		return <>{props.children}</>
    	}
    	
    	const Funnel = ({children}) => {
    		const targetStep = children.find(childStep => childStep.props.name === step) ;
    		return Object.assign(targetStep, { Step })
    	}
    	
    	return [Funnel, setStep]
    }