Style: C++ files have .cc suffix

src/main.cpp → src/main.cc

@@ -2,14 +2,13 @@
 
 using namespace daisy;
 
-DaisySeed hardware;
+static DaisySeed hardware{};
 
 int main()
 {
     hardware.Init();
 
-    while (true)
+    while (true) {
-    {
         hardware.SetLed(true);
         hardware.DelayMs(100);
         hardware.SetLed(false);