text: #ifndef TEST_TESTER_HPP
  #define TEST_TESTER_HPP
  
  #include <vector>
  #include <string>
  
  class Tester {
  public:
      virtual void insert_words(std::vector<std::string> insert_vec) = 0;
      virtual void check_words(std::vector<std::string> check_vec) = 0;
  };
  
  #endif