오류메시지
State updates from the useState() and useReducer() Hooks don't support the second callback argument. To execute a side effect after rendering, declare it in the component body with useEffect().
input 여러개 상태관리 하다가 떴는데 없어졌음
참고) https://react.vlpt.us/basic/09-multiple-inputs.html
오늘 한거