public class Cat {
    private String fullName;

    public String setName(String firstName, String lastName) {
        String fullName = firstName + " " + lastName;
        //write your code here
        this.fullName = fullName;
        return this.fullName;

    }

    public static void main(String[] args) {
        Cat cat = new Cat();
        String firstName = "ami";
        String lastName = "go";
        System.out.println(cat.setName(firstName,lastName));
    }
}