Разбиение символьной строки

#include <iostream>
 
using namespace std;
 
int main()
{
    FILE* fp[2] = { 0 }; 
    char* filename[2] = { "input.txt", "output.txt" };
 
    if ((fp[0] = fopen(filename[0], "rb")) == NULL)
    {
        std::cout << "Unable to open file " << filename[0] << " for reading..." << endl;
        return 1;
    }
 
    if ((fp[1] = fopen(filename[1], "wb")) == NULL)
    {
        std::cout << "Unable to open file " << filename[1] << " for writing..." << endl;
        return 1;
    }
 
    static char line[256] = "\0";
 
    while (fgets(line, 256, fp[0]) != NULL)
    {
        char* tokens[] = { 0 };
        unsigned int mpos = strlen(line) / 2;
 
        std::cout << "string = " << line << endl;
 
        if (line[mpos] != ' ')
        {
            unsigned int n = mpos;
            while (line[n] != ' ' && n < strlen(line)) n++;
            if (!(n >= strlen(line))) mpos = n;
        }
 
        tokens[0] = new char[256];
        strncpy(tokens[0], line, mpos);
 
        tokens[1] = new char[256];
        strncpy(tokens[1], &line[mpos + 1], strlen(line) - mpos - 1);
 
        tokens[0][mpos] = '\0';
        tokens[1][strlen(line) - mpos - 1] = '\0';
 
        std::cout << "Part 1: " << tokens[0] << endl;
        std::cout << "Part 2: " << tokens[1] << endl;
    }
 
    fclose(fp[0]);
    fclose(fp[1]);
 
    std::cin.get();
    std::cin.get();
}