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Add 핸드폰-번호-가리기.js

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Original file line number	Diff line number	Diff line change
`@@ -13,4 +13,12 @@ function solution(phone_number) {`
`13`	`13`	`// phone_number의 -4인덱스부터 끝까지 추출한 문자열을`
`14`	`14`	`// 이어붙인 후 반환`
`15`	`15`	`return "*".repeat(phone_number.length - 4) + phone_number.slice(-4);`
	`16`	`+}`
	`17`	`+`
	`18`	`+// 정답 3 - prove-ability`
	`19`	`+function solution(phone_number) {`
	`20`	`+ var answer = '';`
	`21`	`+ answer += "*".repeat(phone_number.length - 4)`
	`22`	`+ answer += phone_number.slice(phone_number.length - 4, phone_number.length)`
	`23`	`+ return answer;`
`16`	`24`	`}`

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