parsing input

src/main.rs

@@ -0,0 +1,31 @@
+// reads the input and puts into a matrix.
+// each inner vector is a row of the matrix
+fn read_input() -> Vec<Vec<u32>> {
+    let input = std::fs::read_to_string("./input.txt").unwrap();
+
+    let mut trees = vec![];
+    for line in input.lines() {
+        let mut row = vec![];
+        for tree in line.chars() {
+            // parse char to u32
+            let tree_height = tree.to_digit(10).unwrap();
+            row.push(tree_height);
+        }
+
+        trees.push(row);
+    }
+
+    trees
+}
+
+fn main() {
+    println!("Hello, world!");
+
+    let input = read_input();
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn part_one() {}
+}