https://maktabkhooneh.org/course/%D8%A2%D9%85%D9%88%D8%B2%D8%B4-%D8%B1%D8%A7%DB%8C%DA%AF%D8%A7%D9%86-clean-code-mk1125/%D9%81%D8%B5%D9%84-1-%D8%A7%D8%B5%D9%88%D9%84-%DA%A9%D9%84%DB%8C-ch3644/%D9%88%DB%8C%D8%AF%DB%8C%D9%88-%D9%85%D8%B9%D8%B1%D9%81%DB%8C-%D9%85%D9%81%D9%87%D9%88%D9%85-high-cohesion/