[알고리즘] Reverse String

주어진 문자를 역순으로 반환하는 작성하라 
Write a function that takes a string as input and returns the string reversed.

Example:
Given s = “hello”, return “olleh”.

class Solution {
    public String reverseString(String s) {
        char[] word = s.toCharArray();
        char[] newword = new char[word.length];
        for(int i=word.length-1; i>=0; i--){
            newword[(word.length-1)-i] = word[i];
        }
        return new String(newword);
    }    
    // public String reverseString(String s) {
    //     String reverseString = "";
    //     for(int i=s.length()-1; i>=0; i--){
    //         reverseString += s.substring(i,i+1);
    //     }
    //     return reverseString;
    // }
}