refactor: project structure

internal/stats/stats.go

@@ -0,0 +1,35 @@
+package stats
+
+// Min returns the minimum value in a float64 slice.
+// The slice must not be empty.
+func Min(array []float64) float64 {
+	min := array[0]
+	for _, value := range array {
+		if value < min {
+			min = value
+		}
+	}
+	return min
+}
+
+// Max returns the maximum value in a float64 slice.
+// The slice must not be empty.
+func Max(array []float64) float64 {
+	max := array[0]
+	for _, value := range array {
+		if value > max {
+			max = value
+		}
+	}
+	return max
+}
+
+// Avg returns the arithmetic mean of a float64 slice.
+// The slice must not be empty.
+func Avg(array []float64) float64 {
+	sum := 0.0
+	for _, value := range array {
+		sum += value
+	}
+	return sum / float64(len(array))
+}