trying to make a zsh-like shell for windows

#pragma warning (disable : 4996)
#include <iostream>
#include <direct.h>
#include <fstream>
#include <stdio.h>
#include <string>
#include <io.h>
#include <map>
#define clear cout << "\033[H\033[J"
using namespace std;

const string CurrentDateAndTime() {
    time_t     now = time(0);
    struct tm  tstruct;
    char       buf[128];
    tstruct = *localtime(&now);
    strftime(buf, sizeof(buf), "%d/%m/%Y, %X", &tstruct);
    return buf;
}

void help() {
    cout << "Enhanced Z shell, build 0 from November, 2021.\n"
         << "Available commands:\n"
         << "help - shows this message\n"
         << "ls - list contents of current or specified directory\n"
         << "cd - changes current directory\n"
         << "exit - exit the shell\n"
         << "clear - erases all contents of the screen\n";
}

void add_history(string cmd) {
    fstream history;
    history.open("history.zsh", ios::in | ios::out | ios::app);
    history << cmd;
}

int main() {
    ios::sync_with_stdio(false);
    cout.tie(0);
    cin.tie(0);
    register string cmd;
    register string prompt = ": ";
    register char cwd[1024];
    register char path[1024];
    getcwd(cwd, sizeof(cwd));
    register char* username = getenv("USERNAME");
    map<string, int> cmds = {
        {"help", 1},
        {"ls", 2},
        {"cd", 3},
        {"exit", 4},
        {"clear", 5},
        {"echo", 6}
    };
    cout << "Welcome to the Enhanced Z shell, " << username << ".\n";
    cout << CurrentDateAndTime() << "\n";
    while (1) {
        cout << cwd << prompt;
        cin >> cmd;
        add_history(cmd);
        switch (cmds[cmd]) {
        case 1:
            help();
            break;
        case 2:
            system("dir");
            break;
        case 3:
            cin >> path;
            chdir(path);
            break;
        case 4:
            exit(0);
            break;
        case 5:
            clear;
            break;
        case 6:

            break;
        }
    }
    return 0;
}