refactor: Change to Rust's CStr

examples/con.rs

@@ -1,19 +1,15 @@
 #![no_std]
 #![no_main]
 
-use cstr_core::cstr;
 use kos::{dll::Console, threads::exit};
 
 extern crate alloc;
 
 #[no_mangle]
 pub fn kol_main() {
-    let header = cstr!("Rust!");
-    let string = "Hi from Rust!";
-
     let con_lib = Console::import(None).unwrap();
-    con_lib.init(u32::MAX, u32::MAX, u32::MAX, u32::MAX, header);
-    con_lib.write_string(string);
+    con_lib.init(u32::MAX, u32::MAX, u32::MAX, u32::MAX, c"Rust!");
+    con_lib.write_string("Hi from Rust!");
     con_lib.exit(false);
 
     exit();