Write a method that returns the first element of an ArrayList of Strings

If there is no first element in the ArrayList, return the empty String $.$

For example if we had an ArrayList list with the elements $["$hello$",$ "world"$]$:

firstElement$($list$)$

Should return:

"hello"

And the first element of an empty ArrayList:

firstElement$($new ArrayList$())$

Should return:

$""$