support bazel complie this project and format code.

learn_class/modern_cpp_30/SFINAE/sfinae paper/structData.h

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+//
+// Created by light on 20-1-6.
+//
+
+#ifndef MORDEN_C_STRUCTDATA_H
+#define MORDEN_C_STRUCTDATA_H
+// 类型A只有to_string 方法
+struct A {
+};
+
+std::string to_string(const A &) {
+    return "I am A";
+}
+
+// 类型B有serialize方法
+struct B {
+    std::string serialize() const {
+        return "I am B";
+    }
+};
+
+// 类型C有个serialize数据成员与to_string方法
+struct C {
+    std::string serialize;
+};
+
+std::string to_string(const C &) {
+    return "I am C";
+}
+#endif //MORDEN_C_STRUCTDATA_H