freeCodeCamp Challenge Guide: Title Case a Sentence

var i = 0;
function titleCase(str) {
var little = str.toLowerCase();
var words = str.split(" ");

while (i<words.length){
words.replace( words[i].charAt(0).toUpperCase(),words[i].charAt(0));
i++;

}
var joined=words.join();
return joined;
}

titleCase(“I’m a little tea pot”);

Why is my code wrong?

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