Fix error repoted by clippy 0.1.78

[OuyangHang33]

Fix: #44

Version: clippy 0.1.78 (4a0cc88 2024-03-11)
cargo clippy -- -D warnings -A clippy::only-used-in-recursion -A incomplete-features -A clippy::bad_bit_mask -A clippy::derivable_impls

[OuyangHang33]

still need to fix this kind of error:
error: the item Box is imported redundantly
--> executor/src/executor.rs:9:13
|
9 | alloc::{boxed::Box, collections::vec_deque::VecDeque, sync::Arc},
| ^^^^^^^^^^
|
::: /home/xiaoyu/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/prelude/mod.rs:125:13
|
125 | pub use super::v1::*;
| --------- the item Box is already defined here
|
= note: -D unused-imports implied by -D warnings
= help: to override -D warnings add #[allow(unused_imports)]