diff --git a/internal/imports/formatter.go b/internal/imports/formatter.go
index 27f661d..4ed4c02 100644
--- a/internal/imports/formatter.go
+++ b/internal/imports/formatter.go
@@ -11,6 +11,7 @@ import (
 	"path/filepath"
 	"sort"
 	"strings"
+	"sync"
 
 	"golang.org/x/tools/go/packages"
 )
@@ -27,15 +28,23 @@ var (
 	ErrEmptyPaths      = errors.New("empty paths")
 	ErrNotGoFile       = errors.New("not go file")
 	ErrGoGeneratedFile = errors.New("go generated file")
+	ErrGoModNotExist   = errors.New("go mod not exist")
 )
 
+// stdPackages -> save std packages for later search
+// packageNames -> map path to its go.mod package name
+// formattedPaths -> make sure we not format path more than 1 time
 type Formatter struct {
-	stdPackages   map[string]struct{}
-	companyPrefix string
-	isList        bool
-	isWrite       bool
-	isDiff        bool
-	isVerbose     bool
+	stdPackages      map[string]struct{}
+	packageNames     map[string]string
+	formattedPaths   map[string]struct{}
+	companyPrefix    string
+	muPackageNames   sync.RWMutex
+	muFormattedPaths sync.RWMutex
+	isList           bool
+	isWrite          bool
+	isDiff           bool
+	isVerbose        bool
 }
 
 func NewFormmater(opts ...FormatterOptionFn) (*Formatter, error) {
@@ -56,6 +65,9 @@ func NewFormmater(opts ...FormatterOptionFn) (*Formatter, error) {
 	}
 	ft.log("stdPackages: %+v\n", ft.stdPackages)
 
+	ft.packageNames = make(map[string]string)
+	ft.formattedPaths = make(map[string]struct{})
+
 	return ft, nil
 }
 
@@ -67,6 +79,11 @@ func (ft *Formatter) Format(paths ...string) error {
 
 	// Logic switch case copy from goimports, gofumpt
 	for _, path := range paths {
+		path = strings.TrimSpace(path)
+		if path == "" {
+			continue
+		}
+
 		switch dir, err := os.Stat(path); {
 		case err != nil:
 			return fmt.Errorf("os: failed to stat: [%s] %w", path, err)
@@ -89,6 +106,13 @@ func (ft *Formatter) formatDir(path string) error {
 }
 
 func (ft *Formatter) formatFile(path string) error {
+	ft.muFormattedPaths.RLock()
+	if _, ok := ft.formattedPaths[path]; ok {
+		ft.muFormattedPaths.RUnlock()
+		return nil
+	}
+	ft.muFormattedPaths.RUnlock()
+
 	// Return if not go file
 	if !isGoFile(filepath.Base(path)) {
 		return ErrNotGoFile
@@ -118,12 +142,23 @@ func (ft *Formatter) formatFile(path string) error {
 	}
 	ft.log("importsAST: %+v\n", importsAST)
 
+	// TODO: Find dir go.mod package name
+	pkgName, err := ft.packageName(path)
+	if err != nil {
+		return err
+	}
+	ft.log("pkgName: %+v\n", pkgName)
+
 	groupImports, err := ft.groupImports(importsAST)
 	if err != nil {
 		return err
 	}
 	ft.log("groupImports: %+v\n", groupImports)
 
+	ft.muFormattedPaths.Lock()
+	ft.formattedPaths[path] = struct{}{}
+	ft.muFormattedPaths.Unlock()
+
 	return nil
 }
 
@@ -216,6 +251,44 @@ func (ft *Formatter) groupImports(importsAST map[string]*ast.ImportSpec) (map[st
 	return result, nil
 }
 
+func (ft *Formatter) packageName(path string) (string, error) {
+	ft.muPackageNames.RLock()
+	if pkgName, ok := ft.packageNames[path]; ok {
+		ft.muPackageNames.RUnlock()
+		return pkgName, nil
+	}
+	ft.muPackageNames.RUnlock()
+
+	// Copy from goimports-reviser
+	// Check path/go.mod first
+	// If not exist -> check ../go.mod
+	// Assume path is dir path, maybe wrong but it is ok for now
+	dirPath := filepath.Clean(path)
+	var goModPath string
+	for {
+		goModPath = filepath.Join(dirPath, "go.mod")
+		fileInfo, err := os.Stat(goModPath)
+		if err == nil && !fileInfo.IsDir() {
+			break
+		}
+
+		// Check ..
+		if dirPath == filepath.Dir(dirPath) {
+			// Reach root
+			break
+		}
+
+		dirPath = filepath.Dir(dirPath)
+	}
+
+	if goModPath == "" {
+		return "", ErrGoModNotExist
+	}
+	ft.log("goModPath: %+v\n", goModPath)
+
+	return "", nil
+}
+
 // Wrap log.Printf with verbose flag
 func (ft *Formatter) log(format string, v ...any) {
 	if ft.isVerbose {