Write a function that takes a string as input and returns the string reversed.

    Example 1:

    1. Input: "hello"
    2. Output: "olleh"

    Example 2:

    Input: "A man, a plan, a canal: Panama"
Output: "amanaP :lanac a ,nalp a ,nam A"

    /**
 * @param {string} s
 * @return {string}
 */
var reverseString = function(s) {
    const result = [];
    for (let i = s.length - 1; i >=0; i--) {
        result.push(s[i]);
    }
    return result.join('');
};