Some of India’s biggest online vendors of used cars are trimming costs and quitting secondary ventures to prepare for potential stock listings that could raise more than $1 billion combined, according to people familiar with the development.Three Unicorn startups — CARS24 Services Pvt., CarDekho and Spinny — that buy and sell pre-owned vehicles are in early talks with bankers to assess investor appetite, the people said, asking not to be named as the talks are private. The startups are also assessing restr ...