public void BasicTests()
 {
     Assert.Equal(string.Join(",", new[] { "*" }), string.Join(",", Kata.TowerBuilder(1)));
     Assert.Equal(string.Join(",", new[] { " * ", "***" }), string.Join(",", Kata.TowerBuilder(2)));
     Assert.Equal(string.Join(",", new[] { "  *  ", " *** ", "*****" }), string.Join(",", Kata.TowerBuilder(3)));
 }