Part 2 is solved

src/main.rs

@@ -5,6 +5,6 @@ fn main() {
     let file_path = args
         .get(1)
         .expect("Please provide an argument on command-line.");
-    let max = prob1::solve(file_path);
+    let max = prob1::solve_part2(file_path);
     println!("{max}");
 }

src/prob1/mod.rs

@@ -1,7 +1,9 @@
-pub fn solve(file_path: &str) -> i32 {
+use std::cmp::Reverse;
+
+pub fn solve_part1(file_path: &str) -> i32 {
     let contents =
         std::fs::read_to_string(file_path).expect("Please provide a text file as an argument.");
-    let lines: Vec<&str> = contents.split("\n").collect();
+    let lines: Vec<&str> = contents.split('\n').collect();
 
     let mut max = 0;
     let mut accumulated = 0;
@@ -15,3 +17,21 @@ pub fn solve(file_path: &str) -> i32 {
     });
     max
 }
+
+pub fn solve_part2(file_path: &str) -> i32 {
+    let contents =
+        std::fs::read_to_string(file_path).expect("Please provide a text file as an argument.");
+    let lines: Vec<&str> = contents.split('\n').collect();
+    let mut numbers: Vec<i32> = Vec::with_capacity(lines.len());
+    let mut accumulated = 0;
+    lines.iter().for_each(|number| {
+        if let Ok(yay) = number.parse::<i32>() {
+            accumulated += yay;
+        } else {
+            numbers.push(accumulated);
+            accumulated = 0;
+        }
+    });
+    numbers.sort_by_key(|w| Reverse(*w));
+    numbers[0] + numbers[1] + numbers[2]
+}