In db.go method GetExpiry() placed next to SetExpiry() method.

internal/captcha/db.go

@@ -14,10 +14,10 @@ var expiredScanInterval = 60 * time.Second
 type ICaptchaDB interface {
 	New(data string) (ICaptcha, ID)
 	SetExpiry(expiry time.Duration)
+	GetExpiry() time.Duration
 	Image(id ID) (*image.Image, error)
 	Solve(id ID, answer Answer) (bool, error)
 	IsSolved(id ID) bool
-	GetExpiry() time.Duration
 }
 
 type CaptchaDB struct {