text: #ifndef COMPARE_VERSION_NUMBERS_HPP_
  #define COMPARE_VERSION_NUMBERS_HPP_
  
  #include <string>
  #include <vector>
  
  using namespace std;
  
  class CompareVersionNumbers {
  public:
      int compareVersion(string version1, string version2);
  
  private:
      int compareDigitsString(string num1, string num2);
  
      void tokenize(const string &version, vector<string> &versions);
  };
  
  #endif // COMPARE_VERSION_NUMBERS_HPP_
  