static public string Play(string input)
{
//初期値
var moveMng = new MovementManager('B', 'A');
var output = new StringBuilder();
output.Append('A');
foreach (var command in input)
{
if (command == 'r')
{
moveMng.TurnRight();
}
else if (command == 'l')
{
moveMng.TurnLeft();
}
else if (command == 'b')
{
moveMng.Back();
}
else
{
return(string.Format("無効な文字\'{0}\'が含まれています", command));
}
output.Append(moveMng.NowNode);
}
return(output.ToString());
}
