Refactor function that reading files from folders tree - go

Question

I have the following structure of my project like that:
main.go
/data
/1
1.json
/2
2.json
/3
3.json
And I have the following function that works well
const (
data = "./data"
)
type Hello struct {
S string `json:"hello"`
}
func myFunc() {
folders, err := os.ReadDir(data)
if err != nil {
log.Fatalf("read dir: %s", err)
}
for _, folder := range folders {
path := filepath.Join(data, folder.Name())
files, err := os.ReadDir(path)
if err != nil {
log.Fatalf("read dir: %s", err)
}
for _, file := range files {
pathToFile := filepath.Join(path, file.Name())
b, err := os.ReadFile(pathToFile)
if err != nil {
log.Println(err)
}
h := Hello{}
err = json.Unmarshal(b, &h)
if err != nil {
log.Printf("unmarshall erro: %w\n", err)
}
fmt.Println(h)
}
}
}
I should refactor my data tree and divide data folder into two additional folders. So my structure should be like this:
main.go
/data
/dog
/1
1.json
/2
2.json
/cat
/3
3.json
So I need to fix my function according to this structure of the files.
I don't want to hardcode and make the solution with additional for loop. But I think it is not good solution.
func myfunc() {
subFolders, err := os.ReadDir(data)
if err != nil {
log.Fatalf("read dir: %s", err)
}
for _, subFolder := range subFolders {
pathToSubFolder := filepath.Join(data, subFolder.Name())
folders, err := os.ReadDir(pathToSubFolder)
if err != nil {
log.Fatalf("read dir1: %s", err)
}
for _, folder := range folders {
path := filepath.Join(pathToSubFolder, folder.Name())
files, err := os.ReadDir(path)
if err != nil {
log.Fatalf("read dir2: %s", err)
}
for _, file := range files {
pathToFile := filepath.Join(path, file.Name())
b, err := os.ReadFile(pathToFile)
if err != nil {
log.Println(err)
}
h := Hello{}
err = json.Unmarshal(b, &h)
if err != nil {
log.Printf("unmarshall erro: %w\n", err)
}
fmt.Println(h)
}
}
}
}
This soultion works but can anyone suggest another solution that could be better?
Thanks in advance