Run go fmt

This patch is the result of running `go fmt ./...` with Go v1.16.15.

src/server/server.go

@@ -10,10 +10,10 @@ import (
 )
 
 type Server struct {
-	Addr   string
-	db     *storage.Storage
-	worker *worker.Worker
-	cache  map[string]interface{}
+	Addr        string
+	db          *storage.Storage
+	worker      *worker.Worker
+	cache       map[string]interface{}
 	cache_mutex *sync.Mutex
 
 	BasePath string
@@ -28,10 +28,10 @@ type Server struct {
 
 func NewServer(db *storage.Storage, addr string) *Server {
 	return &Server{
-		db:     db,
-		Addr:   addr,
-		worker: worker.NewWorker(db),
-		cache:  make(map[string]interface{}),
+		db:          db,
+		Addr:        addr,
+		worker:      worker.NewWorker(db),
+		cache:       make(map[string]interface{}),
 		cache_mutex: &sync.Mutex{},
 	}
 }