Just another update

Task/Happy-numbers/Go/happy-numbers.go

@@ -1,33 +1,29 @@
 package main
 
-import (
-    "fmt"
-    "strconv"
-)
+import "fmt"
 
 func happy(n int) bool {
-    m := make(map[int]int)
-    for n > 1 {
-        m[n] = 0
-        s := strconv.Itoa(n)
-        n = 0
-        for _, d := range s {
-            x := int(d) - '0'
-            n += x * x
-        }
-        if _, ok := m[n]; ok {
-            return false
-        }
-    }
-    return true
+	m := make(map[int]bool)
+	for n > 1 {
+		m[n] = true
+		var x int
+		for x, n = n, 0; x > 0; x /= 10 {
+			d := x % 10
+			n += d * d
+		}
+		if m[n] {
+			return false
+		}
+	}
+	return true
 }
 
 func main() {
-    for found, n := 0, 1; found < 8; n++ {
-        if happy(n) {
-            fmt.Print(n, " ")
-            found++
-        }
-    }
-    fmt.Println("")
+	for found, n := 0, 1; found < 8; n++ {
+		if happy(n) {
+			fmt.Print(n, " ")
+			found++
+		}
+	}
+	fmt.Println()
 }