https://www.scconline.com/blog/post/2020/10/09/hp-hc-non-joinder-of-proper-parties-cannot-be-said-to-be-a-formal-defect-to-seek-liberty-under-or-xxiii-r-13-read-with-s-151-cpc-rather-can-be-cured-by-filing-impleadment-amendment-of-plaint/