Part 1 and first pass at Part 2

fifteen/main.go

@@ -0,0 +1,25 @@
+package fifteen
+
+import "fmt"
+
+type Fifteen struct {
+	path path
+}
+
+func Init(filepath string) *Fifteen {
+	fifteen := &Fifteen{
+		path: path{},
+	}
+
+	fifteen.path.load(filepath)
+	return fifteen
+}
+
+func (d *Fifteen) Answer() string {
+	return fmt.Sprintf("The total risk of the least risky path is %d", d.path.totalRisk())
+}
+
+func (d *Fifteen) FollowUp() string {
+	scaled := d.path.scale(5, 5)
+	return fmt.Sprintf("The total risk of the least risky path is %d", scaled.totalRisk())
+}