support bazel complie this project and format code.

practical_exercises/key_exercises/bracket_overloading.cpp

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+/* 中括号重载.cpp */
+#include <cstring>
+#include <iostream>
+using namespace std;
+struct Person { //职工基本信息的结构
+  double salary;
+  char *name;
+};
+class SalaryManaege {
+  Person *employ; //存放职工信息的数组
+  int max;        //数组下标上界
+  int n;          //数组中的实际职工人数
+public:
+  SalaryManaege(int Max = 0) {
+    max = Max;
+    n = 0;
+    employ = new Person[max];
+  }
+  //返回引用特性是可以直接在放在左值，直接使用
+  double &operator[](char *Name) { //重载[]，返回引用
+    Person *p;
+    for (p = employ; p < employ + n; p++)
+      //如果存在处理
+      if (strcmp(p->name, Name) == 0)
+        return p->salary;
+    //不存在情况处理
+    p = employ + n++;
+    p->name = new char[strlen(Name) + 1];
+    strcpy(p->name, Name);
+    p->salary = 0;
+    return p->salary;
+  }
+
+  void display() {
+    for (int i = 0; i < n; i++)
+      cout << employ[i].name << "   " << employ[i].salary << endl;
+  }
+  ~SalaryManaege() { delete[] employ; }
+};
+int main() {
+  SalaryManaege s(3);
+  s["张三"] = 2188.88;
+  s["里斯"] = 1230.07;
+  s["王无"] = 3200.97;
+  cout << "张三\t" << s["张三"] << endl;
+  cout << "里斯\t" << s["里斯"] << endl;
+  cout << "王无\t" << s["王无"] << endl;
+
+  cout << "-------下为display的输出--------\n\n";
+  s.display();
+}