Please help me with my code? Where is my mistake?

Tell us what’s happening:

Your code so far

// the global variable
var globalTitle = "Winter Is Coming";

// Add your code below this line
function urlSlug(title) {
  return title.toLowerCase().split(' ').join('-');
// Add your code above this line

var winterComing = urlSlug(globalTitle); // Should be "winter-is-coming"

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36.

Link to the challenge:

urlSlug(" Winter Is Coming") should return "winter-is-coming"
…it looks like your code doesn’t account for spaces at the beginning or end of the string as well as multiple spaces

Thank you very much. I Understand how to solve.