Refactor epoch reward 3 (#27259)

* refactor: extract store_stake_accounts fn

* refactor: extract store_vote_account fn

* refactor: extract reward history update fn

* clippy: slice

* clippy: slice

Co-authored-by: haoran <haoran@mbook>

runtime/src/bank.rs

@@ -3295,6 +3295,21 @@ impl Bank {
 >>>>>>> c17f15a34f (Refactor epoch reward 2 (#27257))
     }
 
+    fn update_reward_history(
+        &self,
+        stake_rewards: Vec<StakeReward>,
+        mut vote_rewards: Vec<(Pubkey, RewardInfo)>,
+    ) {
+        let additional_reserve = stake_rewards.len() + vote_rewards.len();
+        let mut rewards = self.rewards.write().unwrap();
+        rewards.reserve(additional_reserve);
+        rewards.append(&mut vote_rewards);
+        stake_rewards
+            .into_iter()
+            .filter(|x| x.get_stake_reward() > 0)
+            .for_each(|x| rewards.push((x.stake_pubkey, x.stake_reward_info)));
+    }
+
     fn update_recent_blockhashes_locked(&self, locked_blockhash_queue: &BlockhashQueue) {
         #[allow(deprecated)]
         self.update_sysvar_account(&sysvar::recent_blockhashes::id(), |account| {