fix: coding style and file format for chapter 7.

eBook/exercises/chapter_7/string_reverse.go

@@ -1,41 +1,42 @@
-package main
-
-import "fmt"
-
-func reverse(s string) string {
-	runes := []rune(s)
-	n, h := len(runes), len(runes)/2
-	for i:= 0; i < h; i ++ {
-		runes[i], runes[n-1-i] = runes[n-1-i], runes[i]
-	}
-	return string(runes)
-}
-
-func main() {
-// reverse a string:
-	str := "Google"
-	sl := []byte(str)
-	var rev [100]byte
-	j := 0
-	for i:=len(sl)-1; i >= 0; i-- {
-		rev[j] = sl[i]
-		j++
-	}
-	str_rev := string(rev[:])
-	fmt.Printf("The reversed string is -%s-\n", str_rev)
-// variant: "in place" using swapping 
-	str2 := "Google"
-	sl2 := []byte(str2)
-	for i, j := 0, len(sl2) - 1; i < j; i, j = i+1, j-1 {
-		sl2[i], sl2[j] = sl2[j], sl2[i]
-	}
-	fmt.Printf("The reversed string is -%s-\n", string(sl2))
-// variant: using [] int for runes (necessary for Unicode-strings!):
-	s := "My Test String!"
-	fmt.Println(s, " --> ", reverse(s))
-}
-/* Output:
-The reversed string is -elgooG-
-The reversed string is -elgooG-
-My Test String!  -->  !gnirtS tseT yM
-*/
+package main
+
+import "fmt"
+
+func reverse(s string) string {
+	runes := []rune(s)
+	n, h := len(runes), len(runes)/2
+	for i := 0; i < h; i++ {
+		runes[i], runes[n-1-i] = runes[n-1-i], runes[i]
+	}
+	return string(runes)
+}
+
+func main() {
+	// reverse a string:
+	str := "Google"
+	sl := []byte(str)
+	var rev [100]byte
+	j := 0
+	for i := len(sl) - 1; i >= 0; i-- {
+		rev[j] = sl[i]
+		j++
+	}
+	str_rev := string(rev[:])
+	fmt.Printf("The reversed string is -%s-\n", str_rev)
+	// variant: "in place" using swapping
+	str2 := "Google"
+	sl2 := []byte(str2)
+	for i, j := 0, len(sl2)-1; i < j; i, j = i+1, j-1 {
+		sl2[i], sl2[j] = sl2[j], sl2[i]
+	}
+	fmt.Printf("The reversed string is -%s-\n", string(sl2))
+	// variant: using [] int for runes (necessary for Unicode-strings!):
+	s := "My Test String!"
+	fmt.Println(s, " --> ", reverse(s))
+}
+
+/* Output:
+The reversed string is -elgooG-
+The reversed string is -elgooG-
+My Test String!  -->  !gnirtS tseT yM
+*/