CREATE TABLE table_30985 ("Club" TEXT, "Outgoing Head Coach" TEXT, "Date of vacancy" TEXT, "Manner of departure" TEXT, "Incoming Head Coach" TEXT, "Date of appointment" TEXT)

Who was the incoming head coach after Wan Jamak Wan Hassan quit the coaching job?
SELECT "Incoming Head Coach" FROM table_30985 WHERE "Outgoing Head Coach" = 'Wan Jamak Wan Hassan'
SELECT "Incoming Head Coach" FROM "table_30985" WHERE "Outgoing Head Coach" = 'Wan Jamak Wan Hassan'