[문제링크 - 프로그래머스 - 배열 두 배 만들기] https://school.programmers.co.kr/learn/courses/30/lessons/120809
class Solution {
public int[] solution(int[] numbers) {
int[] answer = new int[numbers.length];
for(int i=0; i<numbers.length; i++){
answer[i] = numbers[i] * 2;
}
return answer;
}
}