diff --git a/src/day01.rs b/src/day01.rs
index 78fb353..4b6159c 100644
--- a/src/day01.rs
+++ b/src/day01.rs
@@ -1,4 +1,4 @@
-use crate::utils::read_data;
+use crate::utils::parse_data;
 use anyhow::Result;
 
 fn count_incrementing_windows(window: usize, v: &[usize]) -> usize {
@@ -6,7 +6,7 @@ fn count_incrementing_windows(window: usize, v: &[usize]) -> usize {
 }
 
 pub(crate) fn run() -> Result<(usize, usize)> {
-    let data = read_data::<usize>("data/day01.txt")?;
+    let data = parse_data::<usize>(include_str!("../data/day01.txt"))?;
     Ok((
         count_incrementing_windows(1, &data),
         count_incrementing_windows(3, &data),
@@ -19,14 +19,14 @@ mod tests {
 
     #[test]
     fn test_example() {
-        let data = read_data::<usize>("data/day01-test.txt").unwrap();
+        let data = parse_data::<usize>(include_str!("../data/day01-test.txt")).unwrap();
         assert_eq!(count_incrementing_windows(1, &data), 7);
         assert_eq!(count_incrementing_windows(3, &data), 5);
     }
 
     #[test]
     fn test_my_data() {
-        let data = read_data::<usize>("data/day01.txt").unwrap();
+        let data = parse_data::<usize>(include_str!("../data/day01.txt")).unwrap();
         assert_eq!(count_incrementing_windows(1, &data), 1298);
         assert_eq!(count_incrementing_windows(3, &data), 1248);
     }
diff --git a/src/day02.rs b/src/day02.rs
index df4a9d3..40813cb 100644
--- a/src/day02.rs
+++ b/src/day02.rs
@@ -1,4 +1,3 @@
-use crate::utils::read_file;
 use anyhow::Result;
 
 fn parse_line(s: &str) -> (&str, i32) {
@@ -34,7 +33,7 @@ fn follow_course_better(s: &str) -> i32 {
 }
 
 pub(crate) fn run() -> Result<(usize, usize)> {
-    let input = read_file("data/day02.txt")?;
+    let input = include_str!("../data/day02.txt");
     Ok((
         follow_course(&input) as usize,
         follow_course_better(&input) as usize,
@@ -47,15 +46,15 @@ mod tests {
 
     #[test]
     fn test_example() {
-        let input = read_file("data/day02-test.txt").unwrap();
-        assert_eq!(follow_course(&input), 150);
-        assert_eq!(follow_course_better(&input), 900);
+        let input = include_str!("../data/day02-test.txt");
+        assert_eq!(follow_course(input), 150);
+        assert_eq!(follow_course_better(input), 900);
     }
 
     #[test]
     fn test_my_data() {
-        let input = read_file("data/day02.txt").unwrap();
-        assert_eq!(follow_course(&input), 2070300);
-        assert_eq!(follow_course_better(&input), 2078985210);
+        let input = include_str!("../data/day02.txt");
+        assert_eq!(follow_course(input), 2070300);
+        assert_eq!(follow_course_better(input), 2078985210);
     }
 }
diff --git a/src/day03.rs b/src/day03.rs
index 1a686b0..d29e846 100644
--- a/src/day03.rs
+++ b/src/day03.rs
@@ -1,4 +1,3 @@
-use crate::utils::read_file;
 use anyhow::Result;
 
 fn strings_to_ints(s: &str) -> Vec<usize> {
@@ -89,7 +88,7 @@ fn diagnose_lifesupport(s: &str) -> usize {
 }
 
 pub(crate) fn run() -> Result<(usize, usize)> {
-    let input = read_file("data/day03.txt")?;
+    let input = include_str!("../data/day03.txt");
     Ok((diagnose_power(&input), diagnose_lifesupport(&input)))
 }
 
@@ -99,14 +98,14 @@ mod tests {
 
     #[test]
     fn test_example() {
-        let input = read_file("data/day03-test.txt").unwrap();
+        let input = include_str!("../data/day03-test.txt");
         assert_eq!(diagnose_power(&input), 198);
         assert_eq!(diagnose_lifesupport(&input), 230);
     }
 
     #[test]
     fn test_my_data() {
-        let input = read_file("data/day03.txt").unwrap();
+        let input = include_str!("../data/day03.txt");
         assert_eq!(diagnose_power(&input), 4191876);
         // assert_eq!(follow_course(&input), 2070300);
         // assert_eq!(follow_course_better(&input), 2078985210);
diff --git a/src/day04.rs b/src/day04.rs
index 01acaa4..1e4a695 100644
--- a/src/day04.rs
+++ b/src/day04.rs
@@ -1,4 +1,3 @@
-use crate::utils::read_file;
 use anyhow::Result;
 
 #[derive(Debug)]
@@ -70,10 +69,10 @@ fn find_winning_score(s: &str, first: bool) -> usize {
 }
 
 pub(crate) fn run() -> Result<(usize, usize)> {
-    let input = read_file("data/day04.txt")?;
+    let input = include_str!("../data/day04.txt");
     Ok((
-        find_winning_score(&input, true),
-        find_winning_score(&input, false),
+        find_winning_score(input, true),
+        find_winning_score(input, false),
     ))
 }
 #[cfg(test)]
@@ -82,14 +81,14 @@ mod tests {
 
     #[test]
     fn test_example() {
-        let input = read_file("data/day04-test.txt").unwrap();
+        let input = include_str!("../data/day04-test.txt");
         assert_eq!(find_winning_score(&input, true), 4512);
         assert_eq!(find_winning_score(&input, false), 1924);
     }
 
     #[test]
     fn test_my_data() {
-        let input = read_file("data/day04.txt").unwrap();
+        let input = include_str!("../data/day04.txt");
         assert_eq!(find_winning_score(&input, true), 71708);
         assert_eq!(find_winning_score(&input, false), 34726);
     }
diff --git a/src/utils.rs b/src/utils.rs
index b9a3384..a498da0 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -1,9 +1,5 @@
 use anyhow::Result;
-use std::{fs, str::FromStr};
-
-pub fn read_data<T: FromStr>(filename: &str) -> Result<Vec<T>> {
-    parse_data(&read_file(filename)?)
-}
+use std::str::FromStr;
 
 pub fn parse_data<T: FromStr>(s: &str) -> Result<Vec<T>> {
     let mut ret = Vec::new();
@@ -16,7 +12,3 @@ pub fn parse_data<T: FromStr>(s: &str) -> Result<Vec<T>> {
     }
     Ok(ret)
 }
-
-pub fn read_file(filename: &str) -> Result<String> {
-    Ok(fs::read_to_string(filename)?)
-}