프로그래머스 - 치킨 쿠폰 (JAVA)

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class Solution {
    public int solution(int chicken) {
        int coupon = chicken;
       int service = 0;

       while(coupon >= 10){
           service += coupon / 10;
           coupon = coupon / 10 + coupon % 10;
       }

       return service;
    }
}