old_contents: (function(){
    'use strict';
    var tree = require('./walker');
    var dir = process.cwd();
  
    var output = '';
    var parseResult = function(result){
      for (var i in result) {
        if (typeof result[i] === 'string') {
          output += '[' + result[i] + '](' + i + ')\n';
        } else if (typeof result[i] === 'object'){
          parseResult(result[i]);
        }
      }
    };
    tree(dir, function(err, result){
      parseResult(result);
      console.log(output);
    });
  
  })();
  
new_contents: (function(){
    'use strict';
    var tree = require('./walker');
    var dir = process.cwd();
  
    var output = '';
    var parseResult = function(result){
      for (var i in result) {
        if (typeof result[i] === 'string') {
          output += '[' + result[i] + '](' + i + ')\n';
        } else if (typeof result[i] === 'object'){
          output += 'folder: ' + i + '\n';
          parseResult(result[i]);
        }
      }
    };
    tree(dir, function(err, result){
      parseResult(result);
      console.log(output);
    });
  
  })();
  
subject: add folder names