Solve day01 - part 1, error on part 2

days/.gitignore

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+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb

days/01/part2/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "part2"
+version = "0.1.0"

days/01/part2/Cargo.toml

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+[package]
+name = "part2"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

days/01/part2/src/main.rs

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+use std::fs;
+
+// Extract all numbers, digits and letter written digits
+fn extract_numbers(line: &str) -> Vec<u32> {
+    let written_digits: Vec<&str> = vec![
+        "one", "two", "three", "four", "five", "six", "seven", "eight", "nine",
+    ];
+    let mut numbers: Vec<u32> = Vec::new();
+    let mut current_digit_word: String = "".to_owned();
+    for character in line.chars() {
+        if character.is_digit(10) {
+            numbers.push(character.to_digit(10).unwrap());
+            current_digit_word = "".to_owned(); // Reset writing word
+        } else {
+            current_digit_word.push(character);
+            // Check for the presence of any of the digit words
+            for (index, digit_writing) in written_digits.iter().enumerate() {
+                let word_length = digit_writing.len();
+                let positions: Vec<(usize, &str)> =
+                    current_digit_word.match_indices(digit_writing).collect();
+                if positions.len() > 0 {
+                    let start_position = positions[0].0;
+                    let end_position = start_position + word_length;
+                    let current_digit_word_slice = &current_digit_word[end_position..];
+                    current_digit_word = current_digit_word_slice.to_owned();
+                    let digit = index as u32 + 1;
+                    numbers.push(digit);
+                }
+            }
+        }
+    }
+    numbers
+}
+
+// Extract number including letters
+fn extract_number(line: &str) -> u32 {
+    let numbers: Vec<u32> = extract_numbers(line);
+    let first: u32 = numbers[0];
+    let last: u32 = numbers[numbers.len() - 1];
+    let number: u32 = first * 10 + last;
+    number
+}
+
+fn main() {
+    let input_filename: &str = "../data/input.txt";
+
+    let contents =
+        fs::read_to_string(input_filename).expect("Should have been able to read the file");
+
+    let mut sum: u32 = 0;
+    for line in contents.lines() {
+        let number = extract_number(line);
+        println!("{}\t{:?}", line, number);
+        sum += number;
+    }
+    println!("{:?}", sum);
+}

days/01/trebuchet/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "trebuchet"
+version = "0.1.0"

days/01/trebuchet/Cargo.toml

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+[package]
+name = "trebuchet"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

days/01/trebuchet/src/main.rs

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+use std::fs;
+
+fn extract_number(line: &str) -> u32 {
+    let mut has_digit: bool = false;
+    let mut first: u32 = 0;
+    let mut last: u32 = 0;
+    for character in line.chars() {
+        if character.is_digit(10) {
+            if !has_digit {
+                has_digit = true;
+                first = character.to_digit(10).unwrap();
+            }
+            last = character.to_digit(10).unwrap();
+        }
+    }
+    let number: u32 = first * 10 + last;
+    number
+}
+
+fn main() {
+    let input_filename: &str = "../data/input.txt";
+
+    let contents =
+        fs::read_to_string(input_filename).expect("Should have been able to read the file");
+
+    let mut sum: u32 = 0;
+    for line in contents.lines() {
+        let number = extract_number(line);
+        // println!("{:?}", number);
+        sum += number;
+    }
+    println!("{:?}", sum);
+}