Add multilingual language and systems learning tracks

ceb/c-practice-20261101/lesson-2/main.c

@@ -0,0 +1,10 @@
+#include <stdio.h>
+#include <assert.h>
+
+int main(void) {
+    int completed = 2;
+    int *address = &completed;
+    *address += 1;
+    printf("%d\n", completed);
+    return 0;
+}