diff --git a/src/day10/mod.rs b/src/day10/mod.rs
index 32237a1..ce513ed 100644
--- a/src/day10/mod.rs
+++ b/src/day10/mod.rs
@@ -1,111 +1,6 @@
+use crate::puter::Puter;
 use crate::read;
 
-#[derive(Debug, PartialEq, Eq, Clone, Hash)]
-enum Command {
-    AddX(i32),
-    Noop,
-}
-impl Command {
-    fn from_str(s: &str) -> Self {
-        match s {
-            "noop" => Command::Noop,
-            s => {
-                let (c, i) = s.split_once(' ').unwrap();
-                match (c, i.parse::<i32>()) {
-                    ("addx", Ok(i)) => Self::AddX(i),
-                    _ => unreachable!(),
-                }
-            }
-        }
-    }
-
-    fn num_cycles(&self) -> usize {
-        match self {
-            Self::Noop => 1,
-            Self::AddX(_) => 2,
-        }
-    }
-}
-
-struct Puter {
-    register_x: (i32, i32),
-    cycle: usize,
-    pixel_row: [bool; Puter::LINE_WIDTH],
-    rows: Vec<String>,
-    cycles_processing_left: usize,
-
-    signal_strengths: Vec<i32>,
-}
-
-impl Puter {
-    const LINE_WIDTH: usize = 40;
-    const SPRITE_WIDTH: usize = 3;
-    const SPRITE_WIDTH_HALF: usize = Puter::SPRITE_WIDTH / 2;
-
-    pub fn new() -> Self {
-        Self {
-            register_x: (1, 1),
-            cycle: 1,
-            pixel_row: [false; Puter::LINE_WIDTH],
-            rows: Vec::with_capacity(6),
-            cycles_processing_left: 0,
-            signal_strengths: Vec::with_capacity(6),
-        }
-    }
-
-    fn execute(&mut self, cmd: Command) {
-        match cmd {
-            Command::Noop => {}
-            Command::AddX(v) => {
-                self.register_x.1 += v;
-            }
-        };
-        self.cycles_processing_left = cmd.num_cycles();
-    }
-
-    pub fn run(&mut self, program: &str) {
-        let mut lines = program.lines();
-        loop {
-            if self.cycles_processing_left == 0 {
-                match lines.next() {
-                    Some(s) => self.execute(Command::from_str(s)),
-                    _ => return,
-                };
-            }
-
-            self.cycles_processing_left -= 1;
-
-            let pixel = (self.cycle - 1) % Puter::LINE_WIDTH;
-            let is_lit = pixel.abs_diff(self.register_x.0 as usize) <= Puter::SPRITE_WIDTH_HALF;
-            self.pixel_row[pixel] = is_lit;
-            if pixel == Puter::LINE_WIDTH - 1 {
-                self.rows.push(
-                    self.pixel_row
-                        .map(|l| if l { '#' } else { ' ' })
-                        .iter()
-                        .collect(),
-                );
-            } else if pixel == (Puter::LINE_WIDTH / 2) - 1 {
-                self.signal_strengths
-                    .push(self.cycle as i32 * self.register_x.0);
-            }
-
-            if self.cycles_processing_left == 0 {
-                self.register_x.0 = self.register_x.1;
-            }
-            self.cycle += 1;
-        }
-    }
-
-    pub fn signal_strengths(&self) -> Vec<i32> {
-        self.signal_strengths.clone()
-    }
-
-    pub fn output(&self) -> Vec<String> {
-        self.rows.clone()
-    }
-}
-
 pub fn run() {
     let input = read("10");
     let mut device = Puter::new();
diff --git a/src/main.rs b/src/main.rs
index 8cb35f3..d4e2e8f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -11,6 +11,7 @@ mod day07;
 mod day08;
 mod day09;
 mod day10;
+mod puter;
 
 fn main() {
     let today = Local::now().day();
diff --git a/src/puter/mod.rs b/src/puter/mod.rs
new file mode 100644
index 0000000..b58ee0e
--- /dev/null
+++ b/src/puter/mod.rs
@@ -0,0 +1,105 @@
+#[derive(Debug, PartialEq, Eq, Clone, Hash)]
+pub(crate) enum Command {
+    AddX(i32),
+    Noop,
+}
+impl Command {
+    fn from_str(s: &str) -> Self {
+        match s {
+            "noop" => Command::Noop,
+            s => {
+                let (c, i) = s.split_once(' ').unwrap();
+                match (c, i.parse::<i32>()) {
+                    ("addx", Ok(i)) => Self::AddX(i),
+                    _ => unreachable!(),
+                }
+            }
+        }
+    }
+
+    fn num_cycles(&self) -> usize {
+        match self {
+            Self::Noop => 1,
+            Self::AddX(_) => 2,
+        }
+    }
+}
+
+pub(crate) struct Puter {
+    register_x: (i32, i32),
+    cycle: usize,
+    pixel_row: [bool; Puter::LINE_WIDTH],
+    rows: Vec<String>,
+    cycles_processing_left: usize,
+
+    signal_strengths: Vec<i32>,
+}
+
+impl Puter {
+    const LINE_WIDTH: usize = 40;
+    const SPRITE_WIDTH: usize = 3;
+    const SPRITE_WIDTH_HALF: usize = Puter::SPRITE_WIDTH / 2;
+
+    pub fn new() -> Self {
+        Self {
+            register_x: (1, 1),
+            cycle: 1,
+            pixel_row: [false; Puter::LINE_WIDTH],
+            rows: Vec::with_capacity(6),
+            cycles_processing_left: 0,
+            signal_strengths: Vec::with_capacity(6),
+        }
+    }
+
+    fn execute(&mut self, cmd: Command) {
+        match cmd {
+            Command::Noop => {}
+            Command::AddX(v) => {
+                self.register_x.1 += v;
+            }
+        };
+        self.cycles_processing_left = cmd.num_cycles();
+    }
+
+    pub fn run(&mut self, program: &str) {
+        let mut lines = program.lines();
+        loop {
+            if self.cycles_processing_left == 0 {
+                match lines.next() {
+                    Some(s) => self.execute(Command::from_str(s)),
+                    _ => return,
+                };
+            }
+
+            self.cycles_processing_left -= 1;
+
+            let pixel = (self.cycle - 1) % Puter::LINE_WIDTH;
+            let is_lit = pixel.abs_diff(self.register_x.0 as usize) <= Puter::SPRITE_WIDTH_HALF;
+            self.pixel_row[pixel] = is_lit;
+            if pixel == Puter::LINE_WIDTH - 1 {
+                self.rows.push(
+                    self.pixel_row
+                        .map(|l| if l { '#' } else { ' ' })
+                        .iter()
+                        .collect(),
+                );
+            } else if pixel == (Puter::LINE_WIDTH / 2) - 1 {
+                self.signal_strengths
+                    .push(self.cycle as i32 * self.register_x.0);
+            }
+
+            if self.cycles_processing_left == 0 {
+                self.register_x.0 = self.register_x.1;
+            }
+            self.cycle += 1;
+        }
+    }
+
+    pub fn signal_strengths(&self) -> Vec<i32> {
+        self.signal_strengths.clone()
+    }
+
+    pub fn output(&self) -> Vec<String> {
+        self.rows.clone()
+    }
+}