What if someone offers to sell the product and next day sells that product to the another person?

charlie offfers to sell his car for $20000 to david. david is interested to buy it and ask him to give some time to think. second day around 5pm david accept his proposal by sending email. but next day early morning Charlie rang him and says that he sold his car to Eddie.
So, Has the legally binding contract been formed between Charlie and David? discuss with problems solving format.