feat(CTemplate): Move to CMake

C_Tempate/src/main.c

@@ -1,8 +1,25 @@
-#include <stdio.h>
-#include <stdlib.h>
+/**
+ * Copyright [2023] Jiří Štefka <jiriks74>
+ * Project: AdventOfCode
+ * @file main.c
+ * @brief Main entry point
+ * @author jiriks74
+ */
 
+#include <stdio.h>
+
+/**
+ * @brief Main entry point
+ * @param argc Number of command-line arguments.
+ * @param argv Array of command-line arguments.
+ */
+#ifndef TESTING
 int main(int argc, char *argv[])
+#endif
+#ifdef TESTING
+    int main_test(int argc, char *argv[])
+#endif
 {
-    printf("Hello world!\n");
-    return 0;
+  printf("Hello world!\n");
+  return 0;
 }