Uji penghambatan aktivitas alfa-amilase dan alfa-glukosidase secara in vitro pada ekstrak tanaman daun Garcinia Rigida Miq., serta skrining fitokimia pada ekstrak teraktif = In vitro alpha-amylase and alpha-glucosidase activity inhibition assay of the leaf extract of Garcinia Rigida Miq., and phytochemical screening on the most active extract