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Add 가운데-글자-가져오기.js

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Original file line number	Diff line number	Diff line change
`@@ -18,3 +18,15 @@ function solution(s) {`
`18`	`18`
`19`	`19`	`return answer;`
`20`	`20`	`}`
	`21`	`+`
	`22`	`+//정답 3 - prove-ability`
	`23`	`+function solution(s) {`
	`24`	`+ var answer = '';`
	`25`	`+ // 중간 지점 찾기`
	`26`	`+ const point = Math.floor(s.length / 2);`
	`27`	`+ // 짝수인 경우 - (중간지점 - 1) + 중간지점`
	`28`	`+ if(s.length % 2 ===0) answer = s[point - 1] + s[point];`
	`29`	`+ // 홀수인 경우 - 중간지점`
	`30`	`+ else answer = s[point];`
	`31`	`+ return answer;`
	`32`	`+}`

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