C - Renaming File

#include <stdio.h>
#include <stdlib.h>


int main()
{
    system("color 2f");

    char oldname[] = "lola.txt";
    char newname[] = "lucia.txt";
    int result = rename(oldname, newname);
    if(result == 0){
        puts("Successfull rename");
    }else{
        perror("Error: ");
    }

    return 0;
}

C - Renaming File