Hackerrank Question PLSQL Employees not assigned to any department - oracle

Question

Has someone completed the hackerrank PLSQL for the practice "Employees not assigned to any department"? Hackerrank can be a little tricky with the output and I am really stuck on this one. Can you please give a look at the code and let me know if I am missing anything?
The problem is as follows:
Write a PLSQL block which should assign department_id and department_manager to the Active employees who does not belong to any department. Department which you assign to the Active employees should not have any employees tagged to it. (Please check the attached image for the Schema tables and the Output format)
This is the code I have:
SET SERVEROUTPUT ON;
DECLARE
DEPTID DEPT.DEPT_ID%TYPE;
MGRID EMP.MGR_ID%TYPE;
BEGIN
SELECT DEPT_ID, DEPT_HEAD
INTO DEPTID, MGRID
FROM DEPT D
WHERE DEPT_ID NOT IN (SELECT DEPT_ID FROM EMP E WHERE D.DEPT_ID= E.DEPT_ID);
UPDATE EMP E
SET DEPT_ID = DEPTID, MGR_ID= MGRID
WHERE DEPT_ID IS NULL
AND EMP_STATUS='Active';
DECLARE
CURSOR C IS
SELECT E.EMP_ID, E.EMP_FNAME, E.EMP_LNAME, E.EMP_STATUS, D.DEPT_NAME, T2.EMP_FNAME MNG_FNAME, T2.EMP_LNAME MNG_LNAME
FROM EMP E
INNER JOIN DEPT D ON D.DEPT_ID=E.DEPT_ID
INNER JOIN EMP T2 ON E.MGR_ID = T2.EMP_ID
WHERE E.EMP_STATUS='Active'
AND E.DEPT_ID=DEPTID;
BEGIN
DBMS_OUTPUT.PUT_LINE('emp_Id'||'emp_fname'||'emp_Lname'||'emp_Status'||'Dept_name'||'Mgr_name');
FOR I IN C LOOP
DBMS_OUTPUT.PUT_LINE(i.emp_id||''||i.emp_fname||''||i.emp_lname||''||i.emp_status||''||i.dept_name||''||concat(i.mng_fname||'',i.mng_lname));
END LOOP;
END;
END;
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