use std::{
    alloc::{alloc as std_alloc, dealloc as std_dealloc, Layout},
    ffi::CStr,
    mem,
    os::raw::c_char,
};

unsafe fn as_str<'a>(it: *mut [c_char]) -> &'a str {
    CStr::from_ptr(it as *const _).to_str().unwrap()
}

unsafe fn alloc<T>() -> *mut T {
    std_alloc(Layout::new::<T>()) as *mut T
}

unsafe fn dealloc<T>(it: *mut T) {
    std_dealloc(it as *mut _, Layout::new::<T>());
}

unsafe fn use_it(it: *mut [c_char; 10]) {
    // use it
    println!("{}", as_str(it));
    println!("{:?}", *it);

    // we're done with it, so de-allocate it
    dealloc(it);
}

fn main() {unsafe{
    // allocate it
    let it: *mut [c_char; 10] = alloc();

    // initialize it
    *it = *mem::transmute::<_, &_>(b"P455w04d\0\0");

    // use it
    use_it(it);

    // we're done with it, so de-allocate it
    dealloc(it);
}}