Clean a bit + tests

days/src/main/kotlin/Day03.kt

@@ -18,13 +18,11 @@ class Day03(@Lines val input: Input<List<String>>) {
 
         val width = grid.first().length
 
-        while (true) {
+        while (y < grid.size - 1) {
             x += slope.x
             y += slope.y
 
-            if (x >= width) x -= width
-            if (y >= grid.size) break
-            if (grid[y][x] == '#') trees++
+            if (grid[y][x % width] == '#') trees++
         }
 
         return trees
@@ -37,15 +35,11 @@ class Day03(@Lines val input: Input<List<String>>) {
         Slope(x = 7, y = 1),
         Slope(x = 1, y = 2),
     )
-        .map { it to part1(it) }
-        .onEach { println("$it") }
-        .map { it.second.toLong() }
+        .map { part1(it).toLong() }
         .reduce { acc, trees -> acc * trees }
 }
 
-fun main() {
-    with(createDay<Day03>()) {
-        println(part1().also { check(it == 294) })
-        println(part2().also { check(it == 5774564250) })
-    }
+fun main() = with(createDay<Day03>()) {
+    println(part1())
+    println(part2())
 }