Update module path from example to 10d9e in go.mod and related imports

- Changed module path in go.mod to reflect new repository location.
- Updated import paths in main.go, fft.go, and planner.go to match the new module path.

Author: 10d9e

cmd/example/main.go

@@ -6,7 +6,7 @@ import (
 	"math"
 	"math/cmplx"
 
-	"github.com/example/gofft/pkg/gofft"
+	"github.com/10d9e/gofft/pkg/gofft"
 )
 
 func main() {

go.mod

@@ -1,3 +1,3 @@
-module github.com/example/gofft
+module github.com/10d9e/gofft
 
 go 1.22.0

pkg/gofft/fft.go

@@ -5,7 +5,7 @@
 //
 // Usage:
 //
-//	import "github.com/example/gofft/pkg/gofft"
+//	import "github.com/10d9e/gofft/pkg/gofft"
 //
 //	// Create a planner that automatically selects the best implementation
 //	planner := gofft.NewPlanner()

pkg/gofft/planner.go

@@ -3,7 +3,7 @@ package gofft
 import (
 	"sync"
 
-	"github.com/example/gofft/pkg/gofft/algorithm"
+	"github.com/10d9e/gofft/pkg/gofft/algorithm"
 )
 
 // Planner creates FFT instances for arbitrary sizes