Title Case a Sentence Code not working

Tell us what’s happening:

Hello,
I have write below code for title Case a sentence using slice and concat function. But it is not working though output is coming as required.
Can someone help me in figuring out where i am mistaking?

Your code so far

function titleCase(str) {
 str=str.toLowerCase().split(" ");
 var newsentence="";
 var newstr="";
  for(var i=0; i<=str.length-1;i++)
    {
   newstr =str[i][0].toUpperCase()+str[i].slice(1)+(" ");
 newsentence=newsentence.concat(newstr);
          
    }
 
return newsentence;
 
} 
titleCase("HERE IS MY HANDLE HERE IS MY SPOUT");

Your browser information:

Your Browser User Agent is: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36.

Link to the challenge:
https://www.freecodecamp.org/challenges/title-case-a-sentence

You have an extra space at the end of your string…

caused by your code at line #7

Got the point.Thanks for highlighting that.