How to handle string 1 NG

string1.cpp

#include <stdio.h>
#include <string.h>
#define MAX_PATH  260

char *get_directory(const char *path)
{
    char dir[MAX_PATH+1];
    int i;
    for (i = strlen(path) - 1; i >= 0; i--)
    {
        if (path[i] == '/' || path[i] == '\\')
        {
            strncpy(dir, path, i + 1);
            dir[i + 1] = '\0';
            break;
        }
    }
    return dir;
}

int main(int argc, char* argv[])
{
    char *dir;
    char *path;
    if (argc != 2)
    {
        puts("Invalid argument!");
        return 0;
    }
    path = argv[1];

    printf("path: %s\n", path);
    dir = get_directory(path);
    printf("dir : %s\n", dir);

    return 0;
}