Is it possible to make a ship so fast...?

Complying with today's current scientific standards we are definitely unable to produce a space ship with those rate of hyper acceleration,the energy generated,from such a reaction could easily disintegrate the material of the ship,additionally to travel a light year in 3 days would VIOLATE the laws and principles of Einsteins theory of general relativity would collapse since by your desired situation it is required o travel at 100+ times the speed speed of light