SQL & PL/SQL :: Block Using Substitution Variable

Declare a variable called sal to store the salary of an employee. In the executable part of the program, do the following:

a.Store an employee name in a substitution variable.
b.Store his or her salary in a variable.
c.If the salary is less than 5,000, give the employee a 10% raise and display the message "<Employee Name> salary updated" in the window.
d.If the salary is more Last Name Message than or equal to 3,000, print the employee's salary in the format, "<Employee Name> earns ............. No raise is given."

So the result should ask for the last name

- Himuro and message should show [Himuro's salary updated]
- Greenberg [Greenberg earns 12000. No raise is given.]
- Patel [Patel's salary updated]

Here is my PL/SQL

set serveroutput on

DECLARE
v_emp_sal employees.salary%type;
v_emp_last_name employees.last_name%type;
BEGIN
v_emp_last_name :=initcap('&emplastname');
SELECT salary
INTO v_emp_sal
[code]......

question:
How can I get the apostrophe in the dbms_output.put_line. Attached is the create employees table code.