fixup! Add another defer exercise

exercises/028_defer2.zig

@@ -10,6 +10,8 @@ pub fn main() void {
     for (animals) |a| printAnimal(a);
 
     std.debug.print("done.\n", .{});
+
+    std.debug.print("Answer to everything? {d}\n", .{calculateTheUltimateQuestionOfLife()});
 }
 
 // This function is _supposed_ to print an animal name in parentheses
@@ -35,3 +37,24 @@ fn printAnimal(animal: u8) void {
 
     std.debug.print("Unknown", .{});
 }
+
+// This function is supposed to calculate the answer to the
+// ultimate question of life, the universe, and everything,
+// but it needs to be deferred as far in the future as possible,
+// in order to gather more data.
+//
+// When there are multiple defers in a single block, they are executed in reverse order.
+// This example might seem silly, but it's important to know when e.g.
+// deinitializing containers whose elements need to be deinitialized first.
+fn calculateTheUltimateQuestionOfLife() u32 {
+    var x: u32 = 100;
+
+    // Try reordering the statements to get the answer 42
+    {
+        defer x = x / 10;
+        defer x = x + 11;
+        defer x = x * 2;
+    }
+
+    return x;
+}

exercises/116_defer3.zig

@@ -1,18 +0,0 @@
-//
-// When there are multiple defers in a single block, they are executed in reverse order.
-//
-const std = @import("std");
-
-pub fn main() void {
-    var x: u32 = 100;
-    {
-        // Try reordering the statements to get the answer 42
-        defer x = x / 10;
-        defer x = x + 11;
-        defer x = x * 2;
-
-        // It might seem silly in this example, but it's important to know when
-        // deinitializing containers whose elements need to be deinitialized first.
-    }
-    std.debug.print("{d}\n", .{x});
-}