The problem Battleship contract solves

It is a 2 player game, where there are 2 players.

1. Attacker
2. Defender

There are 5*5 grid ie. 25 positions.
Defender will choose any 5 positions and place the battleship.

Defender will call choose_square function and pass the merkel root of its choices.

Attacker will guess 5 positions and if the attacker guess more than 2 right positions where the battle ship is place then Attacker will win.
Otherwise defender will win.
Attacker will have to call attack function.