removed debug info

reader.hpp

@@ -17,21 +17,16 @@ private:
     // returns true if at least one record was returned
     bool refill_buffer()
     {
-        std::cout << "refilling buffer\n";
         last_element_idx = -1;
         current_idx = 0;
 
         for (size_t i = 0; i < buffer_size; i++) {
-            std::cout << "buffer refill: i: " << i << '\n';
             if (!(input_stream >> read_buffer[i])) {
-                std::cout << "input stream error\n";
-                std::cout << read_buffer[i] << '\n';
                 break;
             }
             last_element_idx = i;
         }
 
-        std::cout << "buffer refill successfull\n";
         return last_element_idx >= 0;
     }