Use zero-allocation approach for empty slices

For further reading checkout https://github.com/golang/go/wiki/CodeReviewComments#declaring-empty-slices

hyphae/iterators.go

@@ -79,7 +79,7 @@ func PathographicSort(src chan string) <-chan string {
 
 // Subhyphae returns slice of subhyphae.
 func (h *Hypha) Subhyphae() []*Hypha {
-	hyphae := []*Hypha{}
+	var hyphae []*Hypha
 	for subh := range YieldExistingHyphae() {
 		if strings.HasPrefix(subh.Name, h.Name+"/") {
 			hyphae = append(hyphae, subh)

user/files.go

@@ -82,7 +82,7 @@ func SaveUserDatabase() error {
 }
 
 func dumpUserCredentials() error {
-	userList := []*User{}
+	var userList []*User
 
 	// TODO: lock the map during saving to prevent corruption
 	for u := range YieldUsers() {
@@ -119,5 +119,8 @@ func dumpTokens() {
 		log.Println(err)
 		return
 	}
-	os.WriteFile(files.TokensJSON(), blob, 0666)
+	err = os.WriteFile(files.TokensJSON(), blob, 0666)
+	if err != nil {
+		log.Println("an error occurred in dumpTokens function:", err)
+	}
 }

user/users.go

@@ -20,7 +20,7 @@ func YieldUsers() chan *User {
 
 // ListUsersWithGroup returns a slice with users of desired group.
 func ListUsersWithGroup(group string) []string {
-	filtered := []string{}
+	var filtered []string
 	for u := range YieldUsers() {
 		if u.Group == group {
 			filtered = append(filtered, u.Name)