fix(conversion) implement StringSetToPointer with StringSetToSlice

Author: cgoetz-inovex

stackit/internal/conversion/conversion.go

@@ -151,26 +151,8 @@ func StringListToPointer(list basetypes.ListValue) (*[]string, error) {
 // It returns nil if the value is null or unknown.
 // Note: It sorts the resulting slice to ensure deterministic behavior.
 func StringSetToPointer(set basetypes.SetValue) (*[]string, error) {
-	if set.IsNull() || set.IsUnknown() {
-		return nil, nil
-	}
-
-	elements := set.Elements()
-	result := make([]string, 0, len(elements))
-
-	for i, el := range elements {
-		elStr, ok := el.(types.String)
-		if !ok {
-			return nil, fmt.Errorf("element %d in set is not a string (type: %T)", i, el)
-		}
-		result = append(result, elStr.ValueString())
-	}
-
-	// Because Sets are unordered in Terraform, we sort here to
-	// prevent non-deterministic behavior in the provider logic or API calls.
-	sort.Strings(result)
-
-	return &result, nil
+	result, err := StringSetToSlice(set)
+	return &result, err
 }
 
 // StringSetToSlice converts basetypes.SetValue to a slice of strings.