Normalized exercise output, answers (#41)

1. All exercises should print a trailing \n
2. The build script should always show you _exactly_ what it's looking
   for when you get it wrong. Therefore, .output should be set to the
   exact expected output.

exercises/022_errors2.zig

@@ -25,5 +25,5 @@ pub fn main() void {
     // an error. Can you set the type correctly above?
     my_number = MyNumberError.TooSmall;
 
-    std.debug.print("I compiled!", .{});
+    std.debug.print("I compiled!\n", .{});
 }

exercises/023_errors3.zig

@@ -14,7 +14,7 @@ pub fn main() void {
     var a: u32 = addTwenty(44) catch 22;
     var b: u32 = addTwenty(4) ??? 22;
 
-    std.debug.print("a={}, b={}", .{ a, b });
+    std.debug.print("a={}, b={}\n", .{ a, b });
 }
 
 // Please provide the return type from this function.

exercises/024_errors4.zig

@@ -25,7 +25,7 @@ pub fn main() void {
     var b: u32 = makeJustRight(14) catch 0;
     var c: u32 = makeJustRight(4) catch 0;
 
-    std.debug.print("a={}, b={}, c={}", .{ a, b, c });
+    std.debug.print("a={}, b={}, c={}\n", .{ a, b, c });
 }
 
 // In this silly example we've split the responsibility of making

exercises/025_errors5.zig

@@ -19,7 +19,7 @@ pub fn main() void {
     var b: u32 = addFive(14) catch 0;
     var c: u32 = addFive(4) catch 0;
 
-    std.debug.print("a={}, b={}, c={}", .{ a, b, c });
+    std.debug.print("a={}, b={}, c={}\n", .{ a, b, c });
 }
 
 fn addFive(n: u32) MyNumberError!u32 {

exercises/036_enums2.zig

@@ -53,6 +53,7 @@ pub fn main() void {
         \\  <span style="color: #{x:0>6}">Green</span>
         \\  <span style="color: #{}">Blue</span>
         \\</p>
+        \\
     , .{
         @enumToInt(Color.red),
         @enumToInt(Color.green),

exercises/037_structs.zig

@@ -52,7 +52,7 @@ pub fn main() void {
     // Ouch! Glorp takes a punch!
     glorp_the_wise.health -= 10;
 
-    std.debug.print("Your wizard has {} health and {} gold.", .{
+    std.debug.print("Your wizard has {} health and {} gold.\n", .{
         glorp_the_wise.health,
         glorp_the_wise.gold,
     });

exercises/043_pointers5.zig

@@ -73,7 +73,7 @@ fn printCharacter(c: *Character) void {
         .warrior => "Warrior",
     };
 
-    std.debug.print("{s} (G:{} H:{} XP:{})", .{
+    std.debug.print("{s} (G:{} H:{} XP:{})\n", .{
         class_name,
         c.gold,
         c.health,