Add a logger to np_trapping and use it to write the execution time

 *

 * \brief Trapping problem handler.

 */

#include <chrono>

#include <cstdio>

#include <string>

#ifndef INCLUDE_LOGGING_H_

#include "../include/logging.h"

#endif

using namespace std;

extern void frfme(string data_file, string output_path);

 * \return result: `int`

 */

int main(int argc, char **argv) {

  chrono::time_point<chrono::high_resolution_clock> t_start = chrono::high_resolution_clock::now();

  chrono::duration<double> elapsed;

  string frfme_data_file = "../../test_data/trapping/DFRFME";

  string lffft_data_file = "../../test_data/trapping/DLFFFT";

  string output_path = ".";

  string message;

  Logger logger(LOG_DEBG);

  if (argc == 4) {

    frfme_data_file = string(argv[1]);

    lffft_data_file = string(argv[2]);

  }

  frfme(frfme_data_file, output_path);

  lffft(lffft_data_file, output_path);

  elapsed = chrono::high_resolution_clock::now() - t_start;

  message = "INFO: calculation lasted " + to_string(elapsed.count()) + "s.\n";

  logger.log(message);

  return 0;

}