Uji Aktivitas Antioksidan dan Antibakteri dari Ekstrak Etanol Daun, Batang, dan Akar Kangkung Air (Ipomoea aquatica Forssk.) dengan Metode Ultrasound Assisted Extraction = Antioxidant and Antibacterial Activity Test of Ethanol Extract of Leaves, Stems, and Roots of Water Spinach (Ipomoea aquatica Forssk.) with Ultrasound Assisted Extraction Method