"999 is enough for anybody" triple-zero padding (#18)

When I hit 999 exercises, I will finally have reached the ultimate
state of soteriological release and no more exercises will be needed.
The cycle will be complete. All that will be left is perfect quietude,
freedom, and highest happiness.

exercises/028_defer2.zig

@@ -0,0 +1,37 @@
+//
+// Now that you know how "defer" works, let's do something more
+// interesting with it.
+//
+const std = @import("std");
+
+pub fn main() void {
+    const animals = [_]u8{ 'g', 'c', 'd', 'd', 'g', 'z' };
+
+    for (animals) |a| printAnimal(a);
+
+    std.debug.print("done.\n", .{});
+}
+
+// This function is _supposed_ to print an animal name in parentheses
+// like "(Goat) ", but we somehow need to print the end parenthesis
+// even though this function can return in four different places!
+fn printAnimal(animal: u8) void {
+    std.debug.print("(", .{});
+
+    std.debug.print(") ", .{}); // <---- how!?
+
+    if (animal == 'g') {
+        std.debug.print("Goat", .{});
+        return;
+    }
+    if (animal == 'c') {
+        std.debug.print("Cat", .{});
+        return;
+    }
+    if (animal == 'd') {
+        std.debug.print("Dog", .{});
+        return;
+    }
+
+    std.debug.print("Unknown", .{});
+}