feat : add strategy

bot/simulation_engine

@@ -0,0 +1,23 @@
+use solana_client::rpc_client::RpcClient;
+use solana_sdk::transaction::Transaction;
+
+pub struct SimulationEngine {
+    rpc_client: RpcClient,
+}
+
+impl SimulationEngine {
+    pub fn new(rpc_client: RpcClient) -> Self {
+        Self { rpc_client }
+    }
+
+    pub async fn simulate(&self, tx: &Transaction) -> f64 {
+        let (result, _) = self.rpc_client.simulate_transaction(tx).await.unwrap();
+        let accounts_data = result.accounts.unwrap();
+        let mut profit = 0.0;
+        for account in &accounts_data {
+            let lamports = account.lamports.unwrap();
+            profit += lamports as f64 / 1e9;
+        }
+        profit
+    }
+}