Start rust rewrite of old problems

rust-rewrite/day01/Cargo.toml

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+[package]
+name = "day01"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

rust-rewrite/day01/src/main.rs

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+use std::fs;
+
+fn main() {
+    let file = fs::read_to_string("day01.in").unwrap();
+
+    let mut nums: Vec<u32> = vec![];
+    for line in file.split('\n') {
+        if line != "" {
+            nums.push(u32::from_str_radix(line, 10).unwrap());
+        }
+    }
+    let count_a = count_inc(&nums);
+
+    let mut nums2: Vec<u32> = vec![];
+    for (i, _) in nums.iter().enumerate() {
+        if i + 2 < nums.len() {
+            nums2.push(nums[i..i + 3].iter().sum());
+        }
+    }
+    let count_b = count_inc(&nums2);
+
+    println!("Part 1: {}", count_a);
+    println!("Part 2: {}", count_b);
+}
+
+fn count_inc(input: &Vec<u32>) -> usize {
+    let mut count = 0;
+    let mut prev: u32 = 0;
+    for num in input.iter() {
+        if num > &prev && prev != 0 {
+            count += 1;
+        }
+        prev = *num;
+    }
+    count
+}