Almost done haha

src/prob3/mod.rs

@@ -0,0 +1,19 @@
+use std::collections::HashSet;
+
+pub fn solve_part1(file_path: &str) -> i32 {
+    let binding =
+        std::fs::read_to_string(file_path).expect("Please provide a text file as an argument.");
+    let content = binding
+        .lines()
+        .collect::<Vec<&str>>()
+        .iter()
+        .map(|item: &&str| {
+            let (first, last) = item.split_at(item.len() / 2);
+            let second = last.chars().collect::<HashSet<char>>();
+            let intersection = first.chars().collect::<HashSet<char>>();
+            *intersection.intersection(&second).next().unwrap()
+        })
+        .collect::<Vec<char>>();
+
+    0
+}