Работа с файлами (найти маленький косяк)

#include<iostream>
#include<fstream>
#include<cstring>
#include<stdlib.h>
using namespace std;
 
void openFile(){
    char buff[50];
    char filename[50];
    cout<<"Enterfilename: ";
    cin>>filename; 
    ifstream fin(filename);
    fin.getline(buff, 50);
cout<<"File = "<<filename<<" have = "<<buff<<endl; 
fin.close(); 
}
 
 
void setData(){
    char buff[100];
    char filename[50];
    cout<<"Enter filename: ";
    cin>>filename; 
    ofstream fout(filename, ios_base::out | ios_base::trunc);
    cout<<"Enter data: ";
    gets(buff);
    fout<<gets(buff);
    fout.close();
}
 
void task(){
    char string[50];
    char nfileName[50], filename[50];
    cout<<"Enter filename foropen file: ";
    cin>>filename;
    cout<<endl;
    ifstream fin(filename);//÷èòàííÿ ç ôàéëóäàíèõ
    fin.getline(string, 50); 
    cout<<"File "<<filename<<" consistis = "<<string<<endl;
    fin.close();
    cout<<"Enter new name file for rewriting: ";
    cin>>nfileName;
    cout<<endl;
 
//ñòâîðåííÿ íîâîãî ôàéëó äëÿ ïåðåçàïèñó
    ofstream fout(nfileName, ios_base::out | ios_base::trunc);
 
    char *buf = strtok(string, " ");
    while (buf != NULL){
        char *line = new char[strlen(buf)];
        int k = 0;
        for (int i = strlen(buf)-1; i >= 0; i--){
            line[i] = buf[i];
            //k++;
        }
        
        line[strlen(line)-1] = ' ';
        fout<<line;
        delete line;
        buf = strtok(NULL, " ");    
    }
    fout.close();
}
int main(int argc, char** argv) {
    char name[50];
    char menu;
    
    do{
        cout<<"< 1. Openfile. 2. SetDatafile . 3. Completetask. 4. Exit>: ";
        cin>>menu;
        cout<<endl;
        switch(menu){
        case '1':
            openFile();
            break;
        case '2':
            setData();
            break;
        case '3':
            task();
            break;
        }       
    }
    while(menu != '4');
    system("pause");
    return 0;
}

#include <string>
#include <sstream>
#include <vector>
 
void split(const std::string &s, char delim, std::vector<std::string> &elems) {
    std::stringstream ss;
    ss.str(s);
    std::string item;
    while (std::getline(ss, item, delim)) {
        elems.push_back(item);
    }
}
 
 
std::vector<std::string> split(const std::string &s, char delim) {
    std::vector<std::string> elems;
    split(s, delim, elems);
    return elems;
}
 
 
void task(){
    char str[50];
    char nfileName[50], filename[50];
    cout<<"Enter filename foropen file: ";
    cin>>filename;
    cout<<endl;
    ifstream fin(filename);//Г·ГЁГІГ*Г*Г*Гї Г§ ГґГ*éëóäГ*Г*ГЁГµ
    fin.getline(string, 50); 
    cout<<"File "<<filename<<" consistis = "<<str<<endl;
    fin.close();
    cout<<"Enter new name file for rewriting: ";
    cin>>nfileName;
    cout<<endl;
 
//ñòâîðåГ*Г*Гї Г*îâîãî ГґГ*éëó äëÿ ïåðåçГ*ГЇГЁГ±Гі
    ofstream fout(nfileName, ios_base::out | ios_base::trunc);
 
    vector<string> words = split(std::string(str), ' '); 
    for (auto i = words.rbegin(); i != words.rend(); i++)
    {
         fout << *i << endl;
    }
    fout.close();
}

 for (auto i = words.rbegin(); i != words.rend(); i++)

for (std::vector<std::string>::reverse_iterator i = words.rbegin(); i != words.rend(); i++)