update_language_countで使用されているsimplify_language内の正規表現のコンパイルが1度だけ実行されるように修正

Author: ccppjsrb

atcoder-problems-backend/Cargo.lock

@@ -16,3 +16,4 @@ anyhow = "1.0"
 tokio = { version = "1.16", features = ["macros"] }
 regex = "1"
 chrono = "0.4"
+lazy_static = "1.4.0"

atcoder-problems-backend/sql-client/Cargo.toml

@@ -2,6 +2,7 @@ use crate::models::{Submission, UserLanguageCount, UserLanguageCountRank, UserPr
 use crate::{PgPool, MAX_INSERT_ROWS};
 use anyhow::Result;
 use async_trait::async_trait;
+use lazy_static::lazy_static;
 use regex::Regex;
 use sqlx::postgres::PgRow;
 use sqlx::Row;
@@ -190,11 +191,13 @@ impl LanguageCountClient for PgPool {
 }
 
 fn simplify_language(lang: &str) -> String {
-    let re = Regex::new(r"\d*\s*\(.*\)").unwrap();
+    lazy_static! {
+        static ref RE: Regex = Regex::new(r"\d*\s*\(.*\)").unwrap();
+    }
     if lang.starts_with("Perl6") {
         "Raku".to_string()
     } else {
-        re.replace(lang, "").to_string()
+        RE.replace(lang, "").to_string()
     }
 }