code: update head comments

code/10/10.1.without.concepts.cpp

@@ -1,3 +1,13 @@
+//
+// 10.1.without.concepts.cpp
+// chapter 10 cpp20
+// modern c++ tutorial
+//
+// created by changkun at changkun.de
+// https://github.com/changkun/modern-cpp-tutorial
+//
+
+
 #include <list>
 #include <algorithm>
 

code/10/10.2.concepts.cpp

@@ -1,3 +1,13 @@
+//
+// 10.2.concepts.cpp
+// chapter 10 cpp20
+// modern c++ tutorial
+//
+// created by changkun at changkun.de
+// https://github.com/changkun/modern-cpp-tutorial
+//
+
+
 #include <iostream>
 #include <string>
 #include <vector>

code/6/6.1.regex.cpp

@@ -1,11 +1,11 @@
 //
-// 6.1.cpp
+// 6.1.regex.cpp
+// chapter 06 regular expression
 // modern c++ tutorial
 //
 // created by changkun at changkun.de
 // https://github.com/changkun/modern-cpp-tutorial
 //
-// Regular Expression
 
 #include <iostream>
 #include <string>

code/7/7.4.futures.cpp

@@ -1,5 +1,5 @@
 //
-// 7.2.critical.section.a.cpp
+// 7.4.futures.cpp
 // chapter 7 parallelism and concurrency
 // modern c++ tutorial
 //

code/7/7.5.producer.consumer.cpp

@@ -1,5 +1,5 @@
 //
-// 7.5.cpp
+// 7.5.producer.consumer.cpp
 // chapter 7 parallelism and concurrency
 // modern c++ tutorial
 //

code/7/7.6.atomic.cpp

@@ -1,3 +1,12 @@
+//
+// 7.6.atomic.cpp
+// chapter 7 parallelism and concurrency
+// modern c++ tutorial
+//
+// created by changkun at changkun.de
+// https://github.com/changkun/modern-cpp-tutorial
+//
+
 #include <atomic>
 #include <thread>
 #include <iostream>

code/7/7.6.bad.example.cpp

@@ -1,3 +1,12 @@
+//
+// 7.6.bad.example.cpp
+// chapter 7 parallelism and concurrency
+// modern c++ tutorial
+//
+// created by changkun at changkun.de
+// https://github.com/changkun/modern-cpp-tutorial
+//
+
 #include <thread>
 #include <iostream>
 

code/7/7.7.is.lock.free.cpp

@@ -1,3 +1,12 @@
+//
+// 7.7.is.lock.free.cpp
+// chapter 7 parallelism and concurrency
+// modern c++ tutorial
+//
+// created by changkun at changkun.de
+// https://github.com/changkun/modern-cpp-tutorial
+//
+
 #include <atomic>
 #include <iostream>
 

code/7/7.8.memory.order.cpp

@@ -1,3 +1,12 @@
+//
+// 7.8.memory.order.cpp
+// chapter 7 parallelism and concurrency
+// modern c++ tutorial
+//
+// created by changkun at changkun.de
+// https://github.com/changkun/modern-cpp-tutorial
+//
+
 #include <atomic>
 #include <thread>
 #include <vector>

code/9/9.1.noexcept.cpp

@@ -1,11 +1,11 @@
 //
-// 8.1.cpp
+// 9.1.noexcept.cpp
+// chapter 09 others
 // modern c++ tutorial
 //
 // created by changkun at changkun.de
 // https://github.com/changkun/modern-cpp-tutorial
 //
-// noexcept
 
 #include <iostream>
 

code/9/9.2.literals.cpp

@@ -1,11 +1,11 @@
 //
-// 8.2.cpp
+// 9.2.literals.cpp
+// chapter 09 others
 // modern c++ tutorial
 //
 // created by changkun at changkun.de
 // https://github.com/changkun/modern-cpp-tutorial
 //
-// literals
 
 #include <iostream>
 #include <string>

code/9/9.3.alignment.cpp

@@ -1,3 +1,13 @@
+//
+// 9.3.alignment.cpp
+// chapter 09 others
+// modern c++ tutorial
+//
+// created by changkun at changkun.de
+// https://github.com/changkun/modern-cpp-tutorial
+//
+
+
 #include <iostream>
 
 struct Storage {