chore: use errors.New to replace fmt.Errorf with no parameters will much better

examples/credit-card-form/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"log"
 	"strconv"
@@ -50,17 +51,17 @@ func ccnValidator(s string) error {
 	// Credit Card Number should a string less than 20 digits
 	// It should include 16 integers and 3 spaces
 	if len(s) > 16+3 {
-		return fmt.Errorf("CCN is too long")
+		return errors.New("CCN is too long")
 	}
 
 	if len(s) == 0 || len(s)%5 != 0 && (s[len(s)-1] < '0' || s[len(s)-1] > '9') {
-		return fmt.Errorf("CCN is invalid")
+		return errors.New("CCN is invalid")
 	}
 
 	// The last digit should be a number unless it is a multiple of 4 in which
 	// case it should be a space
 	if len(s)%5 == 0 && s[len(s)-1] != ' ' {
-		return fmt.Errorf("CCN must separate groups with spaces")
+		return errors.New("CCN must separate groups with spaces")
 	}
 
 	// The remaining digits should be integers
@@ -76,12 +77,12 @@ func expValidator(s string) error {
 	e := strings.ReplaceAll(s, "/", "")
 	_, err := strconv.ParseInt(e, 10, 64)
 	if err != nil {
-		return fmt.Errorf("EXP is invalid")
+		return errors.New("EXP is invalid")
 	}
 
 	// There should be only one slash and it should be in the 2nd index (3rd character)
 	if len(s) >= 3 && (strings.Index(s, "/") != 2 || strings.LastIndex(s, "/") != 2) {
-		return fmt.Errorf("EXP is invalid")
+		return errors.New("EXP is invalid")
 	}
 
 	return nil

inputreader_windows.go

@@ -4,6 +4,7 @@
 package tea
 
 import (
+	"errors"
 	"fmt"
 	"io"
 	"os"
@@ -129,11 +130,11 @@ func waitForInput(conin, cancel windows.Handle) error {
 
 		return fmt.Errorf("unexpected wait object is ready: %d", event-windows.WAIT_OBJECT_0)
 	case windows.WAIT_ABANDONED <= event && event < windows.WAIT_ABANDONED+2:
-		return fmt.Errorf("abandoned")
+		return errors.New("abandoned")
 	case event == uint32(windows.WAIT_TIMEOUT):
-		return fmt.Errorf("timeout")
+		return errors.New("timeout")
 	case event == windows.WAIT_FAILED:
-		return fmt.Errorf("failed")
+		return errors.New("failed")
 	default:
 		return fmt.Errorf("unexpected error: %w", err)
 	}