feat: explanation as observer too

internal/statistics/tracker.go

@@ -0,0 +1,32 @@
+package statistics
+
+import (
+	"time"
+)
+
+type Tracker struct {
+	start   time.Time
+	steps   uint64
+	Results *Results
+}
+
+func Track() *Tracker {
+	return &Tracker{}
+}
+
+func (t *Tracker) Start() {
+	t.start = time.Now()
+	t.steps = 0
+	t.Results = nil
+}
+
+func (t *Tracker) Step() {
+	t.steps++
+}
+
+func (t *Tracker) End() {
+	t.Results = &Results{
+		StepsTaken:  t.steps,
+		TimeElapsed: uint64(time.Since(t.start).Milliseconds()),
+	}
+}