diff --git a/Cargo.toml b/Cargo.toml
index 0053bbe..df713e6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,3 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+reqwest = {version = "0.11.10", features = ["blocking"]}
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diff --git a/src/bin/04-linkedlist.rs b/src/bin/04-linkedlist.rs
index e69de29..50029fa 100644
--- a/src/bin/04-linkedlist.rs
+++ b/src/bin/04-linkedlist.rs
@@ -0,0 +1,36 @@
+use std::collections::HashSet;
+
+
+const REQUEST_URL: &str = "http://www.pythonchallenge.com/pc/def/linkedlist.php";
+
+
+fn get_next_nothing(current_nothing: String) -> Result<String, reqwest::Error>
+{
+    let client = reqwest::blocking::Client::new();
+    let resp = client.get(REQUEST_URL)
+        .query(&[("nothing", current_nothing)])
+        .send()?;
+
+    let body = resp.text()?;
+    let nothing = body.split_ascii_whitespace().last().unwrap();
+    Ok(nothing.to_string())
+
+}
+
+fn main() -> Result<(), reqwest::Error> {
+
+    let mut nothings= HashSet::new();
+    let mut current_nothing = String::from("12345");
+
+
+    while !nothings.contains(&current_nothing)
+    {
+        nothings.insert(current_nothing.clone());
+        current_nothing = get_next_nothing(current_nothing)?;
+        println!("Next nothing is: {}",current_nothing);
+
+    }
+
+    println!("{:?}", nothings);
+    Ok(())
+}
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