Add day4

2023/day3/day3/src/main.rs

@@ -2,7 +2,7 @@ use std::collections::HashMap;
 use std::fs;
 
 fn main() {
-    let content = fs::read_to_string("inputTest.txt").expect("Could not read file");
+    let content = fs::read_to_string("input.txt").expect("Could not read file");
     let lines: Vec<&str> = content.lines().collect();
 
     let mut output_sum = 0;
@@ -29,7 +29,7 @@ fn main() {
                 if let Some(line) = lines.get(index1) {
                     if index2 < lines[index1].len() {
                         if let Some(character) = line.chars().nth(index2) {
-                            if character != '.' {
+                            if character != '.' && !character.is_digit(10) {
                                 output_sum += num;
 
                                 // Part 2