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Add 시저-암호.js

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Original file line number	Diff line number	Diff line change
`@@ -60,4 +60,23 @@ function solution(s, n) {`
`60`	`60`	`}`
`61`	`61`	`}`
`62`	`62`	`return result;`
	`63`	`+}`
	`64`	`+`
	`65`	`+//정답 4 - prove-ability`
	`66`	`+function solution(s, n) {`
	`67`	`+ var answer = '';`
	`68`	`+ for(let i = 0, len = s.length; i < len; i++) {`
	`69`	`+ if(s[i] === " ") {`
	`70`	`+ answer += " ";`
	`71`	`+ continue;`
	`72`	`+ }`
	`73`	`+ let index = s[i].charCodeAt();`
	`74`	`+ // 65 - 90`
	`75`	`+ // 97 - 122`
	`76`	`+ if(index <= 90 && index + n > 90) index -= 26;`
	`77`	`+ else if (index + n > 122) index -= 26;`
	`78`	`+`
	`79`	`+ answer += String.fromCharCode(index + n)`
	`80`	`+ }`
	`81`	`+ return answer;`
`63`	`82`	`}`

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