/// <summary>
 /// Initializes a new instance of the <see cref="Calculator"/> class.
 /// </summary>
 public Calculator()
 {
     _infixTransformer = new InfixTransformer();
 }
 /// <summary>
 /// Initializes a new instance of the <see cref="Calculator"/> class.
 /// </summary>
 public Calculator()
 {
     _infixTransformer = new InfixTransformer();
 }