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function titleCase(str) {
  var final = str.toLowerCase().split(' ');
  for(var i = 0; i < final.length; i ++){
      final[i] = final[i].substring(0, 1).toUpperCase() +
      final[i].substring(1);
  }
    
  return final.join(' ');
}

titleCase("I'm a little tea pot");