feat: Add C language test fixture for repository mapping

tests/fixtures/languages/c/test.c

@@ -4,3 +4,18 @@ int main() {
     printf("Hello, World!\n");
     return 0;
 }
+#include <stdio.h>
+
+/**
+ * The main entry point of the program
+ * @return 0 on success
+ */
+int main(int argc, char **argv) {
+    printf("Hello, World!\n");
+    return 0;
+}
+
+// Helper function
+void print_message(const char *message) {
+    printf("%s\n", message);
+}