text: #ifndef TEXT_TRANSFORM_H
  #define TEXT_TRANSFORM_H
  
  #include <string>
  
  class TextTransform {
  public:
      virtual void invokeOn(std::string& text, int startIndex, int endIndex) = 0;
  	
  	virtual ~TextTransform() = default;
  };
  
  #endif // TEXT_TRANSFORM_H
  