//update the snake motion while it alive
public void updateSnake(Snake thisSnake, Snake anotherSnake)
{
//check if the sanke crash the body of itsself
//then check if the sanke has ever been crashed
//last, check if the snake is crashing with another snake's body
if (!thisSnake.BodyCollision() &&
!thisSnake.headCollisionFlag &&
thisSnake.headNoCollision(anotherSnake))
{
// Update sanke
thisSnake.Update(gameTime);
}
}
