Function pxs_execlua 

#[unsafe(no_mangle)]
pub extern "C" fn pxs_execlua(
    code: *const c_char,
    file_name: *const c_char,
) -> *mut c_char

Execute some lua code. Will return a String, an empty string means that the code executed succesffuly

The result needs to be freed by calling pxs_free_str