프로그래머스 Lv.0 문자열 겹쳐쓰기

 

<Solution>

class Solution {
    public String solution(String my_string, String overwrite_string, int s) {
        String answer = my_string.substring(0, s)+overwrite_string;
        
        if(my_string.length() > answer.length()) {
        	answer += my_string.substring(answer.length());
        }
        
        return answer;
    }
}