Remove 07.5.md spaces

en/07.5.md

@@ -24,22 +24,22 @@ In Go, most of the file operation functions are located in the `os` package. Her
 
 Code sample:
 ```Go
-	package main
+package main
 
-	import (
-		"fmt"
-		"os"
-	)
-	
-	func main() {
-		os.Mkdir("astaxie", 0777)
-		os.MkdirAll("astaxie/test1/test2", 0777)
-		err := os.Remove("astaxie")
-		if err != nil {
-			fmt.Println(err)
-		}
-		os.RemoveAll("astaxie")
+import (
+	"fmt"
+	"os"
+)
+
+func main() {
+	os.Mkdir("astaxie", 0777)
+	os.MkdirAll("astaxie/test1/test2", 0777)
+	err := os.Remove("astaxie")
+	if err != nil {
+		fmt.Println(err)
 	}
+	os.RemoveAll("astaxie")
+}
 ```
 ## Files
 
@@ -84,26 +84,26 @@ Functions for writing files:
 	
 Code sample:
 ```Go
-	package main
+package main
 
-	import (
-		"fmt"
-		"os"
-	)
-	
-	func main() {
-		userFile := "astaxie.txt"
-		fout, err := os.Create(userFile)		
-		if err != nil {
-			fmt.Println(userFile, err)
-			return
-		}
-		defer fout.Close()
-		for i := 0; i < 10; i++ {
-			fout.WriteString("Just a test!\r\n")
-			fout.Write([]byte("Just a test!\r\n"))
-		}
+import (
+	"fmt"
+	"os"
+)
+
+func main() {
+	userFile := "astaxie.txt"
+	fout, err := os.Create(userFile)		
+	if err != nil {
+		fmt.Println(userFile, err)
+		return
 	}
+	defer fout.Close()
+	for i := 0; i < 10; i++ {
+		fout.WriteString("Just a test!\r\n")
+		fout.Write([]byte("Just a test!\r\n"))
+	}
+}
 ```
 ### Read files
 
@@ -119,30 +119,30 @@ Functions for reading files:
 
 Code sample:
 ```Go
-	package main
+package main
 
-	import (
-		"fmt"
-		"os"
-	)
-	
-	func main() {
-		userFile := "asatxie.txt"
-		fl, err := os.Open(userFile)		
-		if err != nil {
-			fmt.Println(userFile, err)
-			return
-		}
-		defer fl.Close()
-		buf := make([]byte, 1024)
-		for {
-			n, _ := fl.Read(buf)
-			if 0 == n {
-				break
-			}
-			os.Stdout.Write(buf[:n])
-		}
+import (
+	"fmt"
+	"os"
+)
+
+func main() {
+	userFile := "asatxie.txt"
+	fl, err := os.Open(userFile)		
+	if err != nil {
+		fmt.Println(userFile, err)
+		return
 	}
+	defer fl.Close()
+	buf := make([]byte, 1024)
+	for {
+		n, _ := fl.Read(buf)
+		if 0 == n {
+			break
+		}
+		os.Stdout.Write(buf[:n])
+	}
+}
 ```
 ### Delete files