Pinkvilla has exclusively learned, Dhurandhar actress Sara Arjun has landed one of the most challenging roles of her career. After Dhurandhar success, Sara is now set to portray the legendary screen icon Madhubala in filmmaker Jasmeet K Reen’s next directorial venture, to be produced by Sanjay Leela Bhansali.  The film, which is currently in pre-production, is expected to go on floors later this year and promises to be an ambitious cinematic experience rooted in the golden era of Hindi cinema. Sara’s casting will generate considerable buzz within the industry, as she steps into the shoes of one of Indian cinema’s most beloved and enigmatic stars, Madhubala.  Sources close to the project reveal Pinkvilla, “Sara will undergo an extensive physical transformation to authentically portray Madhubala’s timeless grace and charm. From costume detailing to dialect training and look tests, the makers are leaving no stone unturned in recreating the era with precision.”  Directed by Jasmeet K Reen, best known for her acclaimed work in Darlings, the film is being envisioned as a high-octane drama layered with tragic …