Reorganize tests

examples/c/foo4.c

@@ -0,0 +1,15 @@
+int foo(int i, int j, int k) {
+  return i + j + k;
+}
+
+int (* foo2())(int, int, int){
+  return foo;
+}
+
+int (* (* foo3())())(int, int, int){
+  return foo2;
+}
+
+int main() {
+  return foo3()()(2, 2, 2) == 6;
+}