feat : add go solution with problem 326

202508/326 isPowerOfThree/go/app.go

@@ -0,0 +1,26 @@
+package main
+
+import "fmt"
+
+type Solution struct{}
+
+func (s Solution) IsPowerOfThree(n int) bool{
+	if n <= 0{
+		return false
+	}
+	if n == 1{
+		return true
+	}
+	if n % 3 != 0{
+		return false
+	}
+	return s.IsPowerOfThree(n/3)
+}
+
+func main(){
+	solution := Solution{}
+
+	fmt.Println(solution.IsPowerOfThree(27))
+	fmt.Println(solution.IsPowerOfThree(0))
+	fmt.Println(solution.IsPowerOfThree(-1))
+}