Collapsing tree into more sane Go project layout

since I was in here looking at something unrelated...

gotime/gotour-artifacts/exercise-sqrt/main.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"fmt"
+	"math"
+)
+
+// using Newton's method
+func Sqrt(x float64) float64 {
+	z := x - (x * 0.1)
+	for i := 0; i < 1000; i++ {
+		newZ := z - (((z * z) - x) / 2 * z)
+		diff := math.Abs(newZ) - math.Abs(z)
+		if math.Abs(diff) < 0.01 {
+			return newZ
+		}
+		z = newZ
+	}
+	return z
+}
+
+func main() {
+	fmt.Printf("stdlib -> %f\n", math.Sqrt(2))
+	fmt.Printf("newton -> %f\n", Sqrt(2))
+}