diff --git a/.gitignore b/.gitignore
index beb2254..78e1dfb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 target
-build
\ No newline at end of file
+build
+.vscode
\ No newline at end of file
diff --git a/rust/day7/exemple b/rust/day7/exemple
new file mode 100644
index 0000000..bcbb513
--- /dev/null
+++ b/rust/day7/exemple
@@ -0,0 +1,23 @@
+$ cd /
+$ ls
+dir a
+14848514 b.txt
+8504156 c.dat
+dir d
+$ cd a
+$ ls
+dir e
+29116 f
+2557 g
+62596 h.lst
+$ cd e
+$ ls
+584 i
+$ cd ..
+$ cd ..
+$ cd d
+$ ls
+4060174 j
+8033020 d.log
+5626152 d.ext
+7214296 k
\ No newline at end of file
diff --git a/rust/day7/input b/rust/day7/input
new file mode 100644
index 0000000..e69de29
diff --git a/rust/day7/maybe/maybe.rs b/rust/day7/maybe/maybe.rs
new file mode 100644
index 0000000..5353c7b
--- /dev/null
+++ b/rust/day7/maybe/maybe.rs
@@ -0,0 +1,100 @@
+use std::cell::RefCell;
+
+#[derive(Clone)]
+pub struct File {
+    size: u64,
+}
+
+impl File {
+    pub fn new(s: u64) -> File {
+        File { size: (s) }
+    }
+
+    pub fn get_size(&self) -> u64 {
+        self.size
+    }
+}
+
+#[derive(Clone)]
+pub struct Directory {
+    name: String,
+    files: Vec<File>,
+    directories: Vec<RefCell<Directory>>,
+    is_empty: bool,
+    parent_dir: String,
+}
+
+impl Directory {
+    pub fn new(n: &str, parent: &str) -> Directory {
+        Directory {
+            name: n.to_string(),
+            files: Vec::new(),
+            directories: Vec::new(),
+            is_empty: true,
+            parent_dir: parent.to_string(),
+        }
+    }
+
+    pub fn new_file(&mut self, s: u64) {
+        self.is_empty = false;
+        self.files.push(File::new(s));
+    }
+
+    pub fn new_directory(&mut self, n: &str) {
+        self.is_empty = false;
+        self.directories.push(RefCell::new(Directory::new(n, &self.name)));
+    }
+
+    pub fn get_name(&self) -> &str {
+        self.name.as_str()
+    }
+
+    pub fn get_directory(&mut self, n: &str) -> Option<&mut RefCell<Directory>> {
+        self.directories.iter_mut().find(|dir| dir.borrow().get_name() == n)
+    }
+
+    pub fn get_parent(&mut self) -> &str {
+        self.parent_dir.as_str()
+    }
+
+    pub fn print(&self) {
+        println!("{}", self.name);
+        for f in self.files.iter() {
+            println!("File: {}", f.get_size());
+        }
+        for d in self.directories.iter() {
+            d.borrow().printlevel(1);
+        }
+    }
+
+    fn printlevel(&self, level: u64) {
+        let mut space = String::new();
+        for _i in 0..level {
+            space.push('\t');
+        }
+        println!("{}{}", space.clone().pop().unwrap(), self.name);
+        for f in self.files.iter() {
+            println!("{}->File: {}", space, f.get_size());
+        }
+        for d in self.directories.iter() {
+            d.borrow().printlevel(level + 1);
+        }
+    }
+}
+
+fn _main() {
+    // Root directory doesn't need a parent
+    let mut root = Directory::new("/", "/");
+    root.new_file(146);
+    root.new_directory("toto");
+    root.new_file(14323);
+    let toto = root.get_directory("toto").unwrap();
+    // root il existe plus
+    toto.borrow().new_file(5472);
+    toto.borrow().new_directory("tata");
+    //let tata = toto.get_directory("tata").unwrap().borrow();
+    //tata.new_file(77557);
+    let root_name = root.get_name();
+    toto.borrow().new_file(2426);
+    println!("Toto Parent: {}", root.get_parent());
+}
diff --git a/rust/day7/src/main.rs b/rust/day7/src/main.rs
index d0320f3..9d3940a 100644
--- a/rust/day7/src/main.rs
+++ b/rust/day7/src/main.rs
@@ -1,99 +1,36 @@
-use std::borrow::BorrowMut;
+use std::fs::read_to_string;
+mod system;
 
-#[derive(Clone)]
-pub struct File {
-    size: u64,
-}
-
-impl File {
-    pub fn new(s: u64) -> File {
-        File { size: (s) }
-    }
-
-    pub fn get_size(&self) -> u64 {
-        self.size
-    }
-}
-
-#[derive(Clone)]
-pub struct Directory {
-    name: String,
-    files: Vec<File>,
-    directories: Vec<Directory>,
-    is_empty: bool,
-    parent_dir: String,
-}
-
-impl Directory {
-    pub fn new(n: &str, parent: &str) -> Directory {
-        Directory {
-            name: n.to_string(),
-            files: Vec::new(),
-            directories: Vec::new(),
-            is_empty: true,
-            parent_dir: parent.to_string(),
-        }
-    }
-
-    pub fn new_file(&mut self, s: u64) {
-        self.is_empty = false;
-        self.files.push(File::new(s));
-    }
-
-    pub fn new_directory(&mut self, n: &str) {
-        self.is_empty = false;
-        self.directories.push(Directory::new(n, &self.name));
-    }
-
-    pub fn get_name(&mut self) -> &str {
-        self.name.as_str()
-    }
-
-    pub fn get_directory(&mut self, n: &str) -> Option<&mut Directory> {
-        self.directories.iter_mut().find(|dir| dir.get_name() == n)
-    }
-
-    pub fn get_parent(&mut self) -> &str {
-        self.parent_dir.as_str()
-    }
-
-    pub fn print(&mut self) {
-        println!("{}", self.name);
-        for f in self.files.iter() {
-            println!("File: {}", f.get_size());
-        }
-        for d in self.directories.iter() {
-            d.printlevel(1);
-        }
-    }
-
-    fn printlevel(&self, level: u64) {
-        let mut space = String::new();
-        for _i in 0..level {
-            space.push('\t');
-        }
-        println!("{}{}", space.clone().pop().unwrap(), self.name);
-        for f in self.files.iter() {
-            println!("{}->File: {}", space, f.get_size());
-        }
-        for d in self.directories.iter() {
-            d.printlevel(level + 1);
+fn decode(cmd: Vec<&str>) -> system::Disk {
+    let mut index = 1;  // ignoring the first cd /
+    let mut disk = system::Disk::new();
+    while index < cmd.len() {
+        if cmd[index].contains("ls") {
+            index +=1;
+            while (index < cmd.len()) && !(cmd[index].contains("ls") || cmd[index].contains("cd")) {
+                let info : Vec<&str> = cmd[index].split(' ').collect();
+                match info[0] {
+                    "dir" => disk.create_directory(info[1]),
+                    &_ => disk.create_file(info[0].parse::<u64>().unwrap(),info[1])
+                }
+                index +=1;
+            }
+        } else if cmd[index].contains("cd") {
+            let info : Vec<&str> = cmd[index].split(' ').collect();
+            match info[2] {
+                ".." => disk.goto_parent(),
+                &_ => disk.change_directory(info[2]) 
+            }
+            index +=1;
+        } else {
+            index += 1;
         }
     }
+    disk
 }
 
 fn main() {
-    // Root directory doesn't need a parent
-    let mut root = Directory::new("/", "/");
-    root.new_file(146);
-    root.new_directory("toto");
-    root.new_file(14323);
-    let toto = root.get_directory("toto").unwrap();
-    toto.new_file(5472);
-    toto.new_directory("tata");
-    let tata = toto.get_directory("tata").unwrap();
-    tata.new_file(77557);
-    let root_name = root.get_name();
-    toto.new_file(2426);
-    println!("Toto Parent: {}",root.get_parent());
+    let file_content = read_to_string("exemple").unwrap();
+    let final_disk = decode(file_content.split("\n").collect());
+    final_disk.print();
 }
diff --git a/rust/day7/src/system.rs b/rust/day7/src/system.rs
new file mode 100644
index 0000000..c04ecdf
--- /dev/null
+++ b/rust/day7/src/system.rs
@@ -0,0 +1,111 @@
+#[derive(Debug)]
+pub struct File {
+    size: u64,
+    name: String,
+}
+
+#[derive(Debug)]
+pub struct Directory {
+    name: String,
+    index: usize,
+    files: Vec<File>,
+    child: Vec<usize>,
+    parent: usize,
+    sublevel: u64,
+}
+
+pub struct Disk {
+    dir_list: Vec<Directory>,
+    selected_dir: usize,
+}
+
+impl Directory {
+    pub fn new(n: &str, index: usize, parent: usize, sublevel: u64) -> Directory {
+        Directory {
+            name: n.to_string(),
+            index: index,
+            files: Vec::new(),
+            child: Vec::new(),
+            parent: parent,
+            sublevel: sublevel,
+        }
+    }
+
+    pub fn create_file(&mut self, size: u64, name: &str) {
+        self.files.push(File {
+            size: size,
+            name: name.to_string(),
+        });
+    }
+}
+
+impl Disk {
+    pub fn new() -> Disk {
+        let mut disk = Disk {
+            dir_list: Vec::new(),
+            selected_dir: 0,
+        };
+        disk.dir_list.push(Directory::new("/", 0, 0, 0));
+        disk
+    }
+
+    pub fn create_file(&mut self, size: u64, name: &str) {
+        self.dir_list[self.selected_dir].create_file(size, name);
+    }
+
+    pub fn create_directory(&mut self, name: &str) {
+        let index = self.dir_list.len();
+        self.dir_list[self.selected_dir].child.push(index);
+        self.dir_list.push(Directory::new(
+            name,
+            self.dir_list.len(),
+            self.selected_dir,
+            self.dir_list[self.selected_dir].sublevel + 1,
+        ));
+    }
+
+    pub fn change_directory(&mut self, name: &str) {
+        let found_index: usize;
+        match self.dir_list.iter_mut().find(|dir| dir.name == name) {
+            None => {
+                println!("There is no such folder '{}' in the disk.", name);
+                return;
+            }
+            Some(found_dir) => found_index = found_dir.index,
+        }
+        match self.dir_list[self.selected_dir]
+            .child
+            .iter()
+            .find(|&&index| index == found_index)
+        {
+            None => println!(
+                "There is no such folder '{}' in the directory '{}'",
+                name, self.dir_list[self.selected_dir].name
+            ),
+            Some(&found_index) => self.selected_dir = found_index,
+        }
+    }
+
+    pub fn goto_parent(&mut self) {
+        self.selected_dir = self.dir_list[self.selected_dir].parent;
+    }
+
+    pub fn print(&self) {
+        let root = &self.dir_list[0];
+        self.printdir(root);
+    }
+
+    fn printdir(&self, dir: &Directory) {
+        let mut space = String::new();
+        for _ in 0..dir.sublevel {
+            space.push('\t');
+        }
+        println!("{}{} (dir)", space, dir.name);
+        for d in &dir.child {
+            self.printdir(&self.dir_list[*d])
+        }
+        for f in dir.files.iter() {
+            println!("{}\tFile: {}, size: {}", space, f.name, f.size);
+        }
+    }
+}