Cleanup and reorganization

helpers/helpers.go

@@ -0,0 +1,18 @@
+package helpers
+
+import (
+	"strings"
+	"testing"
+)
+
+type Function func(input string) int
+
+func Check(t *testing.T, f Function, input string, expected int) {
+	if actual := f(input); actual != expected {
+		t.Fatalf("Expected %v, got %v", expected, actual)
+	}
+}
+
+func Format(input string) string {
+	return strings.ReplaceAll(input, "\r", "")
+}