message: chore: remove an unnecessary `to_vec`
diff: @@ -28,11 +28,11 @@ use std::sync::Mutex;
  const META_TIP_HEADER_KEY: &[u8] = b"TIP_HEADER";
  const META_CURRENT_EPOCH_KEY: &[u8] = b"CURRENT_EPOCH";
  -fn cell_store_key(tx_hash: &H256, index: u32) -> Vec<u8> {
  +fn cell_store_key(tx_hash: &H256, index: u32) -> [u8; 36] {
  let mut key: [u8; 36] = [0; 36];
  key[..32].copy_from_slice(tx_hash.as_bytes());
  key[32..36].copy_from_slice(&index.to_be_bytes());
  - key.to_vec()
  + key
  }
  #[derive(Clone, Serialize, Deserialize, Eq, PartialEq, Hash, Debug)]
  