Add ugly number answer

Author: tinycedar

Diff for: ugly-number.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"fmt"
+)
+
+func isUgly(num int) bool {
+	if num == 0 {
+		return false
+	}
+	if num == 1 {
+		return true
+	}
+	for num%2 == 0 {
+		num /= 2
+	}
+	for num%3 == 0 {
+		num /= 3
+	}
+	for num%5 == 0 {
+		num /= 5
+	}
+	return num == 1
+}
+
+func main() {
+	fmt.Println(isUgly(-2147483648))
+}