diff --git a/ch10/extract_fn b/ch10/extract_fn
new file mode 100755
index 0000000..847d90d
Binary files /dev/null and b/ch10/extract_fn differ
diff --git a/ch10/extract_fn.rs b/ch10/extract_fn.rs
new file mode 100644
index 0000000..5995935
--- /dev/null
+++ b/ch10/extract_fn.rs
@@ -0,0 +1,21 @@
+fn largest(list: &[i32]) -> &i32 {
+    let mut largest = &list[0];
+
+    for num in list {
+        if num > largest {
+            largest = num;
+        }
+    }
+
+    largest
+}
+
+fn main() {
+    let number_list = vec![30, 52, 12, 69, 23, 50];
+    let large = largest(&number_list);
+    println!("Largest: {large}");
+
+    let number_list = vec![130, 52, 12, 69, 23, 50];
+    let large = largest(&number_list);
+    println!("Largest: {large}");
+}
diff --git a/ch10/lifetime_hypotheses b/ch10/lifetime_hypotheses
new file mode 100755
index 0000000..80ca7e0
Binary files /dev/null and b/ch10/lifetime_hypotheses differ
diff --git a/ch10/lifetime_hypotheses.rs b/ch10/lifetime_hypotheses.rs
new file mode 100644
index 0000000..cb7a050
--- /dev/null
+++ b/ch10/lifetime_hypotheses.rs
@@ -0,0 +1,22 @@
+use std::io;
+
+fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
+    if x.len() > y.len() { x } else { y }    
+}
+
+fn brap<'b>(x: &'b str, y: &str) -> &'b str {
+    if x.len() > y.len() { x } else { "henkieeeeee" }
+}
+
+fn main() {
+    let stronk = String::from("stronkman");
+
+    let ln;
+    {
+        let stonks = "stonks";
+        let mut inp = String::new();
+        io::stdin().read_line(&mut inp).expect("Please input a name");
+        ln = longest(&inp, brap(stronk.as_str(), stonks));
+    }
+    println!("The longest of them all: {}", ln);
+}
diff --git a/ch10/trait_blanket_implementation b/ch10/trait_blanket_implementation
new file mode 100755
index 0000000..e1db53a
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diff --git a/ch10/trait_blanket_implementation.rs b/ch10/trait_blanket_implementation.rs
new file mode 100644
index 0000000..7c93b3f
--- /dev/null
+++ b/ch10/trait_blanket_implementation.rs
@@ -0,0 +1,29 @@
+trait Named {
+    fn say_name(&self) -> String;
+}
+
+trait Bold {
+    fn write_bold(&self);
+}
+
+impl<T: Named> Bold for T {
+    fn write_bold(&self) {
+        println!("!bold {}", self.say_name())
+    }
+}
+
+struct Person {
+    name: String,
+}
+
+impl Named for Person {
+    fn say_name(&self) -> String {
+        self.name.clone()
+    }
+}
+
+fn main() {
+    let p = Person{name: String::from("Jasper")};
+
+    p.write_bold();
+}
diff --git a/ch11/adder/Cargo.lock b/ch11/adder/Cargo.lock
new file mode 100644
index 0000000..efe4e14
--- /dev/null
+++ b/ch11/adder/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "adder"
+version = "0.1.0"
diff --git a/ch11/adder/Cargo.toml b/ch11/adder/Cargo.toml
new file mode 100644
index 0000000..9a5826a
--- /dev/null
+++ b/ch11/adder/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "adder"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/ch11/adder/src/lib.rs b/ch11/adder/src/lib.rs
new file mode 100644
index 0000000..818a362
--- /dev/null
+++ b/ch11/adder/src/lib.rs
@@ -0,0 +1,31 @@
+pub fn add(left: u64, right: u64) -> u64 {
+    left + right
+}
+
+#[derive(Debug)]
+struct Rectangle {
+    width: u32,
+    height: u32,
+}
+
+impl Rectangle {
+    fn can_hold(&self, other: &Rectangle) -> bool {
+        self.width >= other.width && self.height >= other.height
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn explore() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+
+    #[test]
+    fn another() {
+        panic!("Fail!")
+    }
+}
diff --git a/ch12-io-project/minigrep/Cargo.lock b/ch12-io-project/minigrep/Cargo.lock
new file mode 100644
index 0000000..1511dd5
--- /dev/null
+++ b/ch12-io-project/minigrep/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "minigrep"
+version = "0.1.0"
diff --git a/ch12-io-project/minigrep/Cargo.toml b/ch12-io-project/minigrep/Cargo.toml
new file mode 100644
index 0000000..b8302ae
--- /dev/null
+++ b/ch12-io-project/minigrep/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "minigrep"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/ch12-io-project/minigrep/output.txt b/ch12-io-project/minigrep/output.txt
new file mode 100644
index 0000000..5b34572
--- /dev/null
+++ b/ch12-io-project/minigrep/output.txt
@@ -0,0 +1 @@
+To tell your name the livelong day
diff --git a/ch12-io-project/minigrep/poem.txt b/ch12-io-project/minigrep/poem.txt
new file mode 100644
index 0000000..8707527
--- /dev/null
+++ b/ch12-io-project/minigrep/poem.txt
@@ -0,0 +1,9 @@
+I'm nobody! Who are you?
+Are you nobody, too?
+Then there's a pair of us - don't tell!
+They'd banish us, you know.
+
+How dreary to be somebody!
+How public, like a frog
+To tell your name the livelong day
+To an admiring bog!
diff --git a/ch12-io-project/minigrep/src/lib.rs b/ch12-io-project/minigrep/src/lib.rs
new file mode 100644
index 0000000..f43d5c7
--- /dev/null
+++ b/ch12-io-project/minigrep/src/lib.rs
@@ -0,0 +1,55 @@
+pub fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
+	let mut results = Vec::new();
+
+	for line in contents.lines() {
+		if line.contains(query) {
+			results.push(line);			
+		}
+	}
+
+	results
+}
+
+pub fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
+	let mut results = Vec::new();
+	let query = query.to_lowercase();
+
+	for line in contents.lines() {
+		if line.to_lowercase().contains(&query) {
+			results.push(line);
+		}
+	}
+
+	results
+}
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	#[test]
+	fn case_sensitive() {
+		let query = "duct";
+		let contents = "\
+Rust:
+safe, fast, productive.
+Pick three.
+Duct tape.
+		";
+
+		assert_eq!(vec!["safe, fast, productive."], search(query, contents));
+	}
+
+	#[test]
+	fn case_insensitive() {
+		let query = "rUsT";
+		let contents = "\
+Rust:
+safe, fast, productive.
+Pick three.
+Trust me.
+		";
+
+		assert_eq!(vec!["Rust:", "Trust me."], search_case_insensitive(query, contents));
+	}
+}
diff --git a/ch12-io-project/minigrep/src/main.rs b/ch12-io-project/minigrep/src/main.rs
new file mode 100644
index 0000000..cade4a3
--- /dev/null
+++ b/ch12-io-project/minigrep/src/main.rs
@@ -0,0 +1,55 @@
+use std::env;
+use std::fs;
+use std::process;
+use std::error::Error;
+
+use minigrep::{search, search_case_insensitive};
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    let config = Config::build(&args).unwrap_or_else(|err| {
+       eprintln!("problem parsing arguments: {}", err);
+       process::exit(1);
+    });
+
+    if let Err(e) = run(config) {
+       eprintln!("problem running program: {}", e); 
+       process::exit(1);
+    }
+}
+
+struct Config {
+    query: String,
+    file_path: String,
+    ignore_case: bool,
+}
+
+impl Config {
+    fn build(args: &[String]) -> Result<Config, &'static str> {
+        if args.len() < 3 {
+            return Err("not enough arguments");
+        }
+
+        let query = args[1].clone();
+        let file_path = args[2].clone();
+        let ignore_case = env::var("IGNORE_CASE").is_ok();
+
+        Ok(Config{ query, file_path, ignore_case })
+    }
+}
+
+fn run(config: Config) -> Result<(), Box<dyn Error>> {
+    let contents = fs::read_to_string(config.file_path)?;
+
+    let results = if config.ignore_case {
+        search_case_insensitive(&config.query, &contents)
+    } else {
+        search(&config.query, &contents)
+    };
+
+    for line in results {
+        println!("{line}");
+    }
+
+    Ok(())
+}