confirm the endinga FreeCodeCamp challenge
function confirmEnding(str, target) {
    if ( str.substring(str.length - target.length) == target) {
    console.log('RETURN => TRUE : ', str.substring(str.length - target.length));
    overlay(true);
    return true;
  } else {
    console.log('RETURN => FALSE : ', str.substring(str.length - target.length));
    overlay(false);
    return false;
   }
}