Refactored the whole code to a better structure

project/src/handlers/mod.rs

@@ -0,0 +1,10 @@
+pub mod authentication;
+pub mod register;
+
+use crate::db_connection::{DbPool, MyPooledConnection};
+use actix_web::{web, HttpResponse};
+
+pub fn pool_handler(pool: web::Data<DbPool>) -> Result<MyPooledConnection, HttpResponse> {
+    pool.get()
+        .map_err(|e| HttpResponse::InternalServerError().json(e.to_string()))
+}