How to copy the data b/w two paths using ctypes?

See more:

C

Python

practice.c

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

char *transfer(char *f1, char *f2){
    char cmd[500];
    sprintf(cmd, "rsync -av %s %s", f1, f2);
    system(cmd);
}

int main(void){
    transfer("/home/bilal/Pictures/New", "/home/bilal/Music");
    return 0;
}

practice.py

from ctypes import cdll

transfer = cdll.LoadLibrary("/Path/to/practice.so")
transfer.transfer("/home/bilal/Pictures/New", "/home/bilal/Music")

Error
rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1330) [sender=3.2.3]
sent 26,209,993 bytes  received 92,218 bytes  3,506,961.47 bytes/sec
total size is 140,764,280,507,967  speedup is 5,351,804.09

What I have tried:

In this code, I am trying to copy the data from the first path to the second path and I am using ctypes to call the C file in python but when I run the Python code, it gives me so many lines of error. I don't know what is the problem with it and I am just pasting some lines of error. I hope you will understand.