it worky :D

src/main.rs

@@ -1,5 +1,4 @@
-use actix_web_lab::respond::Html;
-use actix_web::{web, App, HttpServer, Result, Responder};
+use actix_web::{web, App, HttpServer};
 
 mod public;
 
@@ -8,10 +7,10 @@ async fn main() -> std::io::Result<()> {
 
     HttpServer::new(|| {
         App::new()
-            .route("/", public::get().to(index))
+            .route("/", web::get().to(public::index))
     })
 
     .bind("0.0.0.0:8080")?
     .run()
     .await
-}
+}

src/public/mod.rs

@@ -1,9 +1,11 @@
 use actix_web_lab::respond::Html;
 use actix_web::{Result, Responder};
+use askama::Template;
+
 
 mod templates;
 
-async fn index() -> Result<impl Responder> {
+pub async fn index() -> Result<impl Responder> {
     let html = templates::IndexTemplate {
         placeholder: "hewwo world"
     }.render().expect("Failed to render index.html");

src/public/templates.rs

@@ -3,5 +3,5 @@ use askama::Template;
 #[derive(Template)]
 #[template(path = "index.html")]
 pub struct IndexTemplate<'a> {
-    placeholder: &'a str, 
+    pub placeholder: &'a str, 
 }