add Newf for formatting fundamental error messages

fundamental.go

@@ -1,5 +1,7 @@
 package fault
 
+import "fmt"
+
 // New creates a new basic fault error.
 func New(message string) error {
  return &fundamental{
@@ -8,6 +10,14 @@ func New(message string) error {
  }
 }
 
+// Newf includes formatting specifiers.
+func Newf(message string, va ...any) error {
+ return &fundamental{
+ msg: fmt.Sprintf(message, va...),
+ location: getLocation(),
+ }
+}
+
 type fundamental struct {
  msg string
  location string