text: module.exports = function mergeTwoStrings(mainString, sideString, num) {
    const mainStrToArr = mainString.split(' ');
    const mergedString = [];
  
    for (let i = 0; i < mainStrToArr.length; i += 1) {
      mergedString.push(mainStrToArr[i]);
      if (i === num) {
        mergedString.push(sideString);
      }
    }
  
    return mergedString.join(' ');
  };
  