Updated reader and problem fix

rot13reader.go

@@ -4,40 +4,29 @@ import (
 	"io"
 	"os"
 	"strings"
-	"fmt"
 )
 
-// TODO: Finish this
-
 type rot13Reader struct {
 	r io.Reader
 }
 
-func (r rot13Reader) Read(b []byte) (int, error) {
-	tmp := make([]byte, 8)
-	n, err := r.Read(tmp)
-	fmt.Println(tmp)
+func (rot13 *rot13Reader) Read(b []byte) (int, error) {
+	n, err := rot13.r.Read(b)
 	if err != nil {
 		return n, err
 	}
-	for i, e := range tmp {
+	for i, e := range b {
 		b[i] = rot13shift(e)
 	}
-	fmt.Println(b)
 	return n, nil
 }
 
 func rot13shift(b byte) byte {
-	if b >= 'N' && b <= 'Z' {
-		return 'A' + ('N' - b)
-	} else if b >= 'n' && b <= 'z' {
-		return 'a' + ('n' - b)
-	} else if b >= 'A' && b <= 'M' {
-		return 'N' + ('A' - b)
-	} else if b >= 'a' && b <= 'm' {
-		return 'n' + ('a' - b)
+	switch {
+		case (b >= 'A' && b <= 'M') || (b >= 'a' && b <= 'm'): b += 13
+		case (b >= 'N' && b <= 'Z') || (b >= 'n' && b <= 'z'): b -= 13
 	}
-	return 0
+	return b
 }
 
 func main() {