look at the code if you want to know what i did

nbt/snbt.go

@@ -0,0 +1,91 @@
+package nbt
+
+import (
+	"fmt"
+	"io"
+)
+
+// PrintSNBTAny documented at https://minecraft.wiki/w/NBT_format#SNBT_format
+func PrintSNBTAny(t any, w io.Writer) (err error) {
+	switch t := t.(type) {
+	case int8:
+		_, err = fmt.Fprintf(w, "%vB", t)
+	case bool:
+		_, err = fmt.Fprintf(w, "%v", t)
+	case int16:
+		_, err = fmt.Fprintf(w, "%vS", t)
+	case int32:
+		_, err = fmt.Fprintf(w, "%vI", t)
+	case int64:
+		_, err = fmt.Fprintf(w, "%vL", t)
+	case float32:
+		_, err = fmt.Fprintf(w, "%vF", t)
+	case float64:
+		_, err = fmt.Fprintf(w, "%vD", t)
+	case string:
+		_, err = fmt.Fprintf(w, "%q", t)
+	case []any:
+		_, err = fmt.Fprintf(w, "[")
+		for _, v := range t {
+			err = PrintSNBTAny(v, w)
+			if err != nil {
+				return
+			}
+			_, err = fmt.Fprintf(w, ",")
+		}
+		_, err = fmt.Fprintf(w, "]")
+	case map[string]any:
+		_, err = fmt.Fprintf(w, "{")
+		for k, v := range t {
+			_, err = fmt.Fprintf(w, "%q:,", k)
+			err = PrintSNBTAny(v, w)
+			if err != nil {
+				return
+			}
+			_, err = fmt.Fprintf(w, ",")
+		}
+		_, err = fmt.Fprintf(w, "}")
+	case []int8:
+		_, err = fmt.Fprintf(w, "[B;")
+		if err != nil {
+			return
+		}
+		for _, v := range t {
+			err = PrintSNBTAny(v, w)
+			if err != nil {
+				return
+			}
+			_, err = fmt.Fprintf(w, ",")
+		}
+		_, err = fmt.Fprintf(w, "]")
+	case []int32:
+		_, err = fmt.Fprintf(w, "[I;")
+		if err != nil {
+			return
+		}
+		for _, v := range t {
+			err = PrintSNBTAny(v, w)
+			if err != nil {
+				return
+			}
+			_, err = fmt.Fprintf(w, ",")
+		}
+		_, err = fmt.Fprintf(w, "]")
+	case []int64:
+		_, err = fmt.Fprintf(w, "[L;")
+		if err != nil {
+			return
+		}
+		for _, v := range t {
+			err = PrintSNBTAny(v, w)
+			if err != nil {
+				return
+			}
+			_, err = fmt.Fprintf(w, ",")
+		}
+		_, err = fmt.Fprintf(w, "]")
+	default:
+		err = UnknownTagTypeErr
+	}
+	return
+}