Title Case a Sentence, not accepted by freeCodeCamp

Tell us what’s happening:
Describe your issue in detail here.
My code is working properly as intended but But freeCodeCamp.org is not accepting it.

  **Your code so far**
function titleCase(str) {
console.log(str);
str = str.toLowerCase();
console.log(str);
let word = str.split(" ");
let line = [];
str = "";
for(let i in word) {
 line = word[i][0].toUpperCase() + word[i].slice(1);
 str += (line + " ");
}
console.log(str);
return str;
}

titleCase("I'm a little tea pot");
titleCase("sHoRt AnD sToUt");
titleCase("HERE IS MY HANDLE HERE IS MY SPOUT");
  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.5005.124 Safari/537.36 Edg/102.0.1245.44

Challenge: Title Case a Sentence

Link to the challenge:

Your code doesn’t quite work properly.

Try this:

titleCase("***" + "HERE IS MY HANDLE HERE IS MY SPOUT" + "***");

Here is the correct line of code. You may want to use this array in the loop. Instead of assigning strings to the line var.

Sure, that’s one potential fix.