ernstwi

let fs = require('fs');
let s = fs.readFileSync(0).toString();

let lvl = 0;
let i = 0;
while (i < s.length) {
    if (s[i] == '(') {
        if (s[i+1] == ')') {
            process.stdout.write('()');
            i += 2;

ernstwi

let fs = require("fs");
let path = require("path");

// From https://gist.github.com/lovasoa/8691344
function walk(dir, callback) {
    fs.readdir(dir, function(err, files) {
        if (err) throw err;
        files.forEach(function(file) {
            var filepath = path.join(dir, file);
            fs.stat(filepath, function(err,stats) {