support bazel complie this project and format code.

learn_class/modern_cpp_30/RAII/heap.cpp

@@ -0,0 +1,35 @@
+#include <iostream>
+
+using namespace std;
+
+class bar {};
+
+// java 程序员风格
+void foo() {
+  cout << "method 1" << endl;
+  bar *ptr = new bar();
+  delete ptr;
+}
+
+bar *make_bar() {
+  bar *ptr = nullptr;
+  try {
+    ptr = new bar();
+  } catch (...) {
+    delete ptr;
+    throw;
+  }
+  return ptr;
+}
+// 独立出函数  分配和释放不在一个函数里
+void foo1() {
+  cout << "method 2" << endl;
+  bar *ptr = make_bar();
+  delete ptr;
+}
+
+int main() {
+  foo();
+  foo1();
+  return 0;
+}