working clang-tidy

clang-tidy is a static analysis tool:
It analyzes C++ source code
It finds bugs, bad practices, and design issues
It uses the same compiler flags as your real build

Examples of what it catches:
Uninitialized variables
Dangling references
Inefficient copies
Dangerous implicit conversions
Missing explicit
Poor modern C++ usage

cplusplus/learning/tut1/main.cpp

@@ -2,7 +2,8 @@
 #include <iostream>
 
 int main() {
-    std::cout << "Hello from tut1\n";
+    int x;
+    std::cout << x;
     fmt::print("Hello from {} using fmt {}\n", "tut1", FMT_VERSION);
 
     return 0;