chore: reorg

__web/warp/Cargo.toml

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+[package]
+name = "warp"
+version = "0.1.0"
+authors = ["Hatter Jiang <jht5945@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+warp = "0.2.4"
+tokio = { version = "0.2", features = ["macros"] }
+

__web/warp/README.md

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+
+warp: https://crates.io/crates/warp
+
+

__web/warp/src/main.rs

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+use warp::Filter;
+
+#[tokio::main]
+async fn main() {
+    // GET /hello/warp => 200 OK with body "Hello, warp!"
+    let hello = warp::path!("hello" / String)
+        .map(|name| format!("Hello, {}!", name));
+
+    warp::serve(hello)
+        .run(([127, 0, 0, 1], 8080))
+        .await;
+}
+