easy method with strings

name.js

var Genius = 'AlBErt EinsTeIn'

function changingName(oldName){
var FixedName = oldName;
  var names = oldName.split(' ');
  names[1] = names[1].toUpperCase();
  names[0] = names[0].slice(0,1).toUpperCase() + names[0].slice(1).toLowerCase();
  FixedName = names.join(' ');
  
  return FixedName;
}

console.log(changingName(Genius));