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fn main() {
let input = include_str!("./input.txt");
let output: u32 = input.lines().map(process_line).sum();
println!("Result {}", output);
}
fn process_line(s: &str) -> u32 {
let mut string = String::new();
let iter: Vec<char> = s.chars().filter(|c| {
c.to_digit(10).is_some()
}).map(|c| c).collect();
assert!(iter.len() >= 1);
let chars = [iter.first(), iter.last()];
for char in chars {
if let Some(c) = char {
string.push(*c);
}
}
string.parse::<u32>().unwrap()
}
#[test]
fn input_1() {
let result = process_line("1abc2");
assert_eq!(result, 12);
}
#[test]
fn input_2() {
let result = process_line("pqr3stu8vwx");
assert_eq!(result, 38);
}
#[test]
fn input_3() {
let result = process_line("a1b2c3d4e5f");
assert_eq!(result, 15);
}
#[test]
fn input_4() {
let result = process_line("treb7uchet");
assert_eq!(result, 77);
}
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