```java
class pola {
    public static void main(String[] args) {
        String name = "fast and furious";
        char s = 'f';
        System.out.println(name.replace(s, '\0'));    //---->line 1
        System.out.println(name.replace("" + s, "")); //---->line 2
    }
}

```

What is the difference between line `1` and `2`?