Creating a package

CREATE OR REPLACE PACKAGE TEST_PACKAGE AS
  FUNCTION TEST_FUNCTION RETURN VARCHAR2;
  PROCEDURE TEST_PROCEDURE;
END TEST_PACKAGE;
/
CREATE OR REPLACE PACKAGE BODY TEST_PACKAGE AS
    FUNCTION TEST_FUNCTION RETURN VARCHAR2 AS
        V_TEST  VARCHAR2(10);
        V_TEST2 VARCHAR2(10) NOT NULL := 'test2';
    BEGIN
        V_TEST := 'test';
        RETURN V_TEST;
    END TEST_FUNCTION;

    PROCEDURE TEST_PROCEDURE IS
    BEGIN
        NULL;
    END TEST_PROCEDURE;
END TEST_PACKAGE;
/