support bazel complie this project and format code.

practical_exercises/key_exercises/func_temp.cpp

@@ -0,0 +1,19 @@
+/* 函数模板.cpp */
+#include <cstring>
+#include <iostream>
+using namespace std;
+
+template <class T> T compareMax(T t1, T t2) { return t1 > t2 ? t1 : t2; }
+
+template <>
+const char *compareMax<const char *>(const char *s1, const char *s2) {
+  cout << "[for debug]"
+       << " call compareMax template" << endl;
+  return strcmp(s1, s2) >= 0 ? s1 : s2;
+}
+int main(int argc, char const *argv[]) {
+  cout << compareMax(1, 2) << endl;
+  cout << compareMax("asda", "qweq") << endl;
+  
+  return 0;
+}