fixed compileError printing

exercises/074_comptime9.zig

@@ -1,4 +1,5 @@
-const print = @import("std").debug.print;
+const std = @import("std");
+const print = std.debug.print;
 
 // We're going to (ab)use the power of Zig to make animal hybrid creatures!
 // What do you think a GatorMouse would look like?  Eek.
@@ -58,7 +59,7 @@ fn makeCreature(comptime count: usize, comptime fmt: []const u8) [count]Animal {
                 // other animals or is this an error?
                 'g' => ???,
 
-                else => @compileError("No animal starts with '" ++ char ++ "'!"),
+                else => @compileError(std.fmt.comptimePrint("No animal starts with '{c}'!", .{char})),
             },
 
             .l => switch (char) {

patches/patches/074_comptime9.patch

@@ -1,6 +1,6 @@
---- exercises/074_comptime9.zig	2026-04-11 21:35:08.132459373 -0700
-+++ answers/074_comptime9.zig	2026-04-12 07:13:37.971010827 -0700
-@@ -27,12 +27,12 @@
+--- exercises/074_comptime9.zig	2026-04-30 19:28:08.990995153 +0200
++++ answers/074_comptime9.zig	2026-04-30 19:27:09.642728692 +0200
+@@ -28,12 +28,12 @@
          start, // Ready to start a new animal.
          l, // This means we've seen an "l", so if we see an "m", we know it's a Llama.
      };
@@ -15,16 +15,16 @@
  
      inline for (fmt) |char| {
  
-@@ -56,7 +56,7 @@
+@@ -57,7 +57,7 @@
                  //
                  // What do you think happens with Gators? Do they join with
                  // other animals or is this an error?
 -                'g' => ???,
 +                'g' => @compileError("Gators refuse to join with other animals."),
  
-                 else => @compileError("No animal starts with '" ++ char ++ "'!"),
+                 else => @compileError(std.fmt.comptimePrint("No animal starts with '{c}'!", .{char})),
              },
-@@ -68,7 +68,7 @@
+@@ -69,7 +69,7 @@
                      next_animal += 1;
                      // Something is missing here. After we finish a Llama, we
                      // need to be ready to _start_ over with a new animal...