[👾 Error Handling] Keys should be unique so that components maintain their identity across updates. Non-unique keys may cause children to be duplicated and/or omitted — the behavior is unsupported and could change in a future version.

## 어떤 에러인가요?
- map 쓸 때 key 관련 오류

## 에러 메시지
```jsx
index.js:1 Warning: Encountered two children with the same key, `24`. Keys should be unique so that components maintain their identity across updates. Non-unique keys may cause children to be duplicated and/or omitted — the behavior is unsupported and could change in a future version.
```

## 에러 핸들링 방법
```jsx
map쓸 때 인자에 idx 추가 후 key로 사용
```

## 에러 핸들링을 위해 참고한 레퍼런스 링크
[예시1](https://stackoverflow.com/questions/59978815/encountered-two-children-with-the-same-key-1-keys-should-be-unique-so-that-c?rq=1)