Here i am getting output as undefined, please tell me why

Question

<script type="text/javascript">

function Employee() {

this.Name="Minhaj"

var getName = function() {

return this.Name;

}

this.PrivGetName=function () {

return getName();

}

Employee.prototype.Publicget=function () {

return this.PrivGetName();

}

}

var obj=new Employee();

alert(obj.Publicget());

//OUTPUT IS UNDEFINED

</script>