use std::boxed::Box;
use libc::c_void;

fn main() {
    show_ptr(get_ptr());
}

fn get_ptr() -> (*mut c_void, *mut c_void) {
    let x = vec!["Hello".to_string(), "World".to_string()].into_boxed_slice();
    let ptr = Box::into_raw(x);
    unsafe { std::mem::transmute::<_, (*mut c_void, *mut c_void)>(ptr) }
}

fn show_ptr(ptr: (*mut c_void, *mut c_void)) {
    let x = unsafe { Box::from_raw(std::mem::transmute::<_, *mut [String]>(ptr)) };
    println!("{:?}", x);
}