(refractor) timer and warm up query

src-core/examples/remove_one_yomitan_dict.rs

@@ -1,7 +1,5 @@
-use std::time::Instant;
-
 use anyhow::Ok;
-use cjdic2_core::AppService;
+use cjdic2_core::{AppService, Timer};
 
 mod common;
 use common::get_db_dir;
@@ -9,10 +7,11 @@ use common::get_db_dir;
 fn main() -> Result<(), anyhow::Error> {
     let service = AppService::new(get_db_dir())?;
 
-    let start = Instant::now();
-    let mut writer = service.get_yomitan_writer()?;
-    AppService::remove_yomitan_dictionary(&mut writer, "JMnedict")?;
-    println!("[{:.2?}]", start.elapsed());
+    {
+        let _timer = Timer::new("remove one".to_string());
+        let mut writer = service.get_yomitan_writer()?;
+        AppService::remove_yomitan_dictionary(&mut writer, "JMnedict")?;
+    }
 
     Ok(())
 }