Access to alternate screen without Drop about crossterm HOT 2 CLOSED

#[no_mangle]
pub extern fn get_screen(raw: bool) -> *mut Screen {
    Box::into_raw(Box::new(Screen::new(raw)))
}

#[no_mangle]
pub extern fn get_alt_screen(ptr: *mut Screen, raw: bool) -> *mut AlternateScreen {
    let s = unsafe {
        assert!(!ptr.is_null());
        &*ptr
    };
    match s.enable_alternate_modes(raw) {
        Ok(a) => Box::into_raw(Box::new(a)),
        Err(_) => ptr::null_mut(),
    }
}

#[no_mangle]
pub extern fn free_screen(ptr: *mut Screen) {
    if ptr.is_null() { return }
    unsafe { drop(Box::from_raw(ptr)); }
}

#[no_mangle]
pub extern fn free_alt_screen(ptr: *mut AlternateScreen) {
    if ptr.is_null() { return }
    unsafe { Box::from_raw(ptr); }
}