text: 
  // You should implement your task here.
  
  module.exports = function towelSort (matrix) {
  
      if(matrix == undefined){
          return [];
      }
  
      let arr = [];
    
      for(let i = 0; i < matrix.length; i++){
        if(i % 2 != 0){
          matrix[i] = matrix[i].reverse();
        }
        for(let j = 0; j < matrix[i].length; j++){
          arr.push(matrix[i][j]);
        }
      }
    
      return arr;
  }
  