function solution(s) {
let answer = '';
if(s.length % 2 === 0){
for(let i = (s.length / 2) - 1; i <= (s.length / 2);i++)
answer += s[i];
}
else{
for(let i = Math.floor(s.length / 2); i <= Math.floor(s.length / 2);i++)
answer += s[i]
}
return answer;
}