Biotransformation of food waste into biofertilisers through composting and anaerobic digestion: a review by Zaini, Nurul Solehah Mohd, Khudair, Abedelazeez J.D., Mohsin, Aliah Zannierah, Jitming Lim, Elicia, Minato, Wakisaka, Idris, Hamidah, Syafawati Yaacob, Jamilah, Rahim, Muhamad Hafiz Abd