diff --git a/Cargo.toml b/Cargo.toml
index 0bbad94..6c18755 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-name = "180daysofrust"
+name = "_180daysofrust"
 version = "0.1.0"
 edition = "2021"
 
diff --git a/src/day01_to_day03/mod.rs b/src/day01_to_day03/mod.rs
index dd10781..7eaa987 100644
--- a/src/day01_to_day03/mod.rs
+++ b/src/day01_to_day03/mod.rs
@@ -10,4 +10,21 @@ pub mod loops;
 pub mod structs;
 pub mod conditionals;
 pub mod enums;
-pub mod pointer_ref;
\ No newline at end of file
+pub mod pointer_ref;
+
+pub fn run() {
+    println!("Days 1-3: Getting Started");
+    print::run();
+    strings::run();
+    functions::run();
+    types::run();
+    arrays::run();
+    vars::run();
+    cli::run();
+    vectors::run();
+    loops::run();
+    structs::run();
+    conditionals::run();
+    enums::run();
+    pointer_ref::run();
+}
\ No newline at end of file
diff --git a/src/day04_to_day06/mod.rs b/src/day04_to_day06/mod.rs
index bbfa740..af58164 100644
--- a/src/day04_to_day06/mod.rs
+++ b/src/day04_to_day06/mod.rs
@@ -1,3 +1,10 @@
 pub mod shadowing;
 pub mod ownership;
 pub mod borrowing;
+
+pub fn run() {
+    println!("Days 4-6: Understanding Ownership");
+    shadowing::run();
+    ownership::run();
+    borrowing::run();
+}
diff --git a/src/day07_to_day09/mod.rs b/src/day07_to_day09/mod.rs
index 967f10f..ef9ade6 100644
--- a/src/day07_to_day09/mod.rs
+++ b/src/day07_to_day09/mod.rs
@@ -3,4 +3,14 @@ pub mod linear_search;
 pub mod binary_search;
 pub mod bubble_sort;
 pub mod palindrome_checker;
-pub mod fibonacci_sequence;
\ No newline at end of file
+pub mod fibonacci_sequence;
+
+pub fn run() {
+    println!("Days 7-9: Common Collections");
+    fibonacci_sequence::run();
+    linear_search::run();
+    binary_search::run();
+    bubble_sort::run();
+    palindrome_checker::run();
+    fibonacci_sequence::run();
+}
\ No newline at end of file
diff --git a/src/day10_to_day12/mod.rs b/src/day10_to_day12/mod.rs
index 8f4cff2..a1bbde6 100644
--- a/src/day10_to_day12/mod.rs
+++ b/src/day10_to_day12/mod.rs
@@ -3,4 +3,16 @@ pub mod error_handling;
 pub mod generics;
 pub mod iterators;
 pub mod lifetimes;
-pub mod smart_pointers;
\ No newline at end of file
+pub mod smart_pointers;
+pub mod traits;
+
+pub fn run() {
+    println!("Days 10-12: Advanced Rust Concepts");
+    closures::examples();
+    error_handling::examples();
+    generics::examples();
+    iterators::examples();
+    lifetimes::examples();
+    smart_pointers::examples();
+    traits::examples();
+}
\ No newline at end of file
diff --git a/src/day13_to_day15/advanced_concurrency.rs b/src/day13_to_day15/advanced_concurrency.rs
new file mode 100644
index 0000000..5a3269e
--- /dev/null
+++ b/src/day13_to_day15/advanced_concurrency.rs
@@ -0,0 +1,24 @@
+use std::sync::{Arc, Mutex};
+use std::thread;
+
+pub fn examples() {
+    println!("Advanced Concurrency Examples:");
+    
+    let counter = Arc::new(Mutex::new(0));
+    let mut handles = vec![];
+
+    for _ in 0..10 {
+        let counter = Arc::clone(&counter);
+        let handle = thread::spawn(move || {
+            let mut num = counter.lock().unwrap();
+            *num += 1;
+        });
+        handles.push(handle);
+    }
+
+    for handle in handles {
+        handle.join().unwrap();
+    }
+
+    println!("Result: {}", *counter.lock().unwrap());
+}
\ No newline at end of file
diff --git a/src/day13_to_day15/advanced_lifetimes.rs b/src/day13_to_day15/advanced_lifetimes.rs
new file mode 100644
index 0000000..34f075b
--- /dev/null
+++ b/src/day13_to_day15/advanced_lifetimes.rs
@@ -0,0 +1,27 @@
+pub fn examples() {
+    println!("Advanced Lifetimes Examples:");
+    
+    let x = 5;
+    let r = &x;
+    print_ref(r);
+    
+    let context = Context("context");
+    let parser = Parser { context: &context };
+    parser.parse("input");
+}
+
+fn print_ref<'a, T>(t: &'a T) where T: std::fmt::Debug + 'a {
+    println!("t: {:?}", t);
+}
+
+struct Context<'a>(&'a str);
+
+struct Parser<'a> {
+    context: &'a Context<'a>,
+}
+
+impl<'a> Parser<'a> {
+    fn parse(&self, input: &str) {
+        println!("Parsing {} in context {}", input, self.context.0);
+    }
+}
\ No newline at end of file
diff --git a/src/day13_to_day15/advanced_traits.rs b/src/day13_to_day15/advanced_traits.rs
new file mode 100644
index 0000000..fd2f38c
--- /dev/null
+++ b/src/day13_to_day15/advanced_traits.rs
@@ -0,0 +1,46 @@
+use std::ops::Add;
+
+pub fn examples() {
+    println!("Advanced Traits Examples:");
+    
+    // Associated types
+    let point1 = Point { x: 1, y: 0 };
+    let point2 = Point { x: 2, y: 3 };
+    let sum = point1 + point2;
+    println!("Sum of points: {:?}", sum);
+
+    // Default type parameters
+    let millimeters = Millimeters(100);
+    let meters = Meters(1);
+    let sum = millimeters + meters;
+    println!("Sum of lengths: {:?}", sum);
+}
+
+#[derive(Debug)]
+struct Point {
+    x: i32,
+    y: i32,
+}
+
+impl Add for Point {
+    type Output = Point;
+
+    fn add(self, other: Point) -> Point {
+        Point {
+            x: self.x + other.x,
+            y: self.y + other.y,
+        }
+    }
+}
+
+#[derive(Debug)]
+struct Millimeters(u32);
+struct Meters(u32);
+
+impl Add<Meters> for Millimeters {
+    type Output = Millimeters;
+
+    fn add(self, other: Meters) -> Millimeters {
+        Millimeters(self.0 + (other.0 * 1000))
+    }
+}
\ No newline at end of file
diff --git a/src/day13_to_day15/macros.rs b/src/day13_to_day15/macros.rs
new file mode 100644
index 0000000..77d42ce
--- /dev/null
+++ b/src/day13_to_day15/macros.rs
@@ -0,0 +1,29 @@
+macro_rules! say_hello {
+    () => {
+        println!("Hello!");
+    };
+    ($name:expr) => {
+        println!("Hello, {}!", $name);
+    };
+}
+
+macro_rules! create_function {
+    ($func_name:ident) => {
+        fn $func_name() {
+            println!("You called {:?}()", stringify!($func_name));
+        }
+    };
+}
+
+create_function!(foo);
+create_function!(bar);
+
+pub fn examples() {
+    println!("Macros Examples:");
+    
+    say_hello!();
+    say_hello!("Alice");
+    
+    foo();
+    bar();
+}
\ No newline at end of file
diff --git a/src/day13_to_day15/mod.rs b/src/day13_to_day15/mod.rs
new file mode 100644
index 0000000..0ca3b51
--- /dev/null
+++ b/src/day13_to_day15/mod.rs
@@ -0,0 +1,14 @@
+mod advanced_traits;
+mod advanced_lifetimes;
+mod unsafe_rust;
+mod macros;
+mod advanced_concurrency;
+
+pub fn run() {
+    println!("Days 13-15: Advanced Rust Concepts");
+    advanced_traits::examples();
+    advanced_lifetimes::examples();
+    unsafe_rust::examples();
+    macros::examples();
+    advanced_concurrency::examples();
+}
\ No newline at end of file
diff --git a/src/day13_to_day15/unsafe_rust.rs b/src/day13_to_day15/unsafe_rust.rs
new file mode 100644
index 0000000..a5b8f74
--- /dev/null
+++ b/src/day13_to_day15/unsafe_rust.rs
@@ -0,0 +1,24 @@
+pub fn examples() {
+    println!("Unsafe Rust Examples:");
+    
+    let mut num = 5;
+    
+    let r1 = &num as *const i32;
+    let r2 = &mut num as *mut i32;
+    
+    unsafe {
+        println!("r1 is: {}", *r1);
+        println!("r2 is: {}", *r2);
+        
+        *r2 = 10;
+        println!("r2 is now: {}", *r2);
+    }
+    
+    unsafe {
+        dangerous();
+    }
+}
+
+unsafe fn dangerous() {
+    println!("This function is unsafe");
+}
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index 95d367e..c801d61 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,76 +1,23 @@
 //Day 01 to day03
 pub mod day01_to_day03;
 
-use day01_to_day03::print;
-use day01_to_day03::strings;
-use day01_to_day03::functions;
-use day01_to_day03::types;
-use day01_to_day03::arrays;
-use day01_to_day03::vars;
-use day01_to_day03::cli;
-use day01_to_day03::loops;
-use day01_to_day03::vectors;
-use day01_to_day03::structs;
-use day01_to_day03::conditionals;
-use day01_to_day03::enums;
-use day01_to_day03::pointer_ref;
-
 //Day04 to day06
 pub mod day04_to_day06;
-use day04_to_day06::shadowing;
-use day04_to_day06::ownership;
-use day04_to_day06::borrowing;
-
 
 //Day 07 to day 09
 pub mod day07_to_day09;
-use day07_to_day09::fibonacci;
-use day07_to_day09::linear_search;
-use day07_to_day09::binary_search;
-use day07_to_day09::bubble_sort;
-use day07_to_day09::palindrome_checker;
-use day07_to_day09::fibonacci_sequence;
 
 //Day 10 to day 12
 pub mod day10_to_day12;
-use day10_to_day12::closures;
-use day10_to_day12::error_handling;
-use day10_to_day12::generics;
-use day10_to_day12::iterators;
-use day10_to_day12::lifetimes;
-use day10_to_day12::smart_pointers;
+
+
+mod day13_to_day15;
 
 fn main() {
-    //Hello world in rust
-    // println!("Hello, world!");
-    // //Print from an another file!
-    // print::run();
-    // strings::run();
-    // functions::run();
-    // types::run();
-    // arrays::run();
-    // vars::run();
-    // cli::run();
-    // loops::run();
-    // vectors::run();
-    // structs::run();
-    // conditionals::run();
-    // enums::run();
-    // pointer_ref::run();
-    // shadowing::run();
-    // ownership::run();
-    // borrowing::run();
-    // fibonacci::run();
-    // linear_search::run();
-    // binary_search::run();
-    // bubble_sort::run();
-    // palindrome_checker::run();
-    // fibonacci_sequence::run();
-    // closures::run();
-    // error_handling::run();
-    // generics::run();
-    // iterators::run();
-    // lifetimes::run();
-    // smart_pointers::run();
+    // day01_to_day03::run();
+    // day04_to_day06::run();
+    // day07_to_day09::run();
+    // day10_to_day12::run();
+    day13_to_day15::run();
 
 }