diff --git a/encoding.go b/encoding.go
index aa9cceb..8c38cea 100644
--- a/encoding.go
+++ b/encoding.go
@@ -171,20 +171,20 @@ const (
 
 	// TypeTextPlain represents the MIME type for plain text content.
 	TypeTextPlain ContentType = "text/plain"
-  
-  // typeSMimeSigned represents the MIME type for S/MIME singed messages.
-  typeSMimeSigned ContentType = `application/pkcs7-signature; name="smime.p7s"`
+
+	// typeSMimeSigned represents the MIME type for S/MIME singed messages.
+	typeSMimeSigned ContentType = `application/pkcs7-signature; name="smime.p7s"`
 )
 
 const (
 	// MIMEAlternative MIMEType represents a MIME multipart/alternative type, used for emails with multiple versions.
 	MIMEAlternative MIMEType = "alternative"
-  // MIMEMixed MIMEType represents a MIME multipart/mixed type used for emails containing different types of content.
-	MIMEMixed       MIMEType = "mixed"
-  // MIMERelated MIMEType represents a MIME multipart/related type, used for emails with related content entities.
-	MIMERelated     MIMEType = "related"
-  // MIMESMime MIMEType represents a MIME multipart/signed type, used for siging emails with S/MIME.
-	MIMESMime       MIMEType = `signed; protocol="application/pkcs7-signature"; micalg=sha-256`
+	// MIMEMixed MIMEType represents a MIME multipart/mixed type used for emails containing different types of content.
+	MIMEMixed MIMEType = "mixed"
+	// MIMERelated MIMEType represents a MIME multipart/related type, used for emails with related content entities.
+	MIMERelated MIMEType = "related"
+	// MIMESMime MIMEType represents a MIME multipart/signed type, used for siging emails with S/MIME.
+	MIMESMime MIMEType = `signed; protocol="application/pkcs7-signature"; micalg=sha-256`
 )
 
 // String satisfies the fmt.Stringer interface for the Charset type.
diff --git a/part.go b/part.go
index 153f281..3fab652 100644
--- a/part.go
+++ b/part.go
@@ -152,7 +152,6 @@ func (p *Part) SetDescription(description string) {
 	p.description = description
 }
 
-
 // SetIsSMimeSigned sets the flag for signing the Part with S/MIME
 func (p *Part) SetIsSMimeSigned(smime bool) {
 	p.smime = smime
diff --git a/smime.go b/smime.go
index 62e07aa..405a5c1 100644
--- a/smime.go
+++ b/smime.go
@@ -11,8 +11,9 @@ import (
 	"encoding/pem"
 	"errors"
 	"fmt"
-	"go.mozilla.org/pkcs7"
 	"strings"
+
+	"go.mozilla.org/pkcs7"
 )
 
 var (