Cleaned trailing spaces, added trailing commas

build.zig

@@ -305,7 +305,7 @@ const exercises = [_]Exercise{
     .{
         .main_file = "058_quiz7.zig",
         .output = "Archer's Point--2->Bridge--1->Dogwood Grove--3->Cottage--2->East Pond--1->Fox Pond",
-        .hint = "This is the biggest program we've seen yet. But you can do it!" 
+        .hint = "This is the biggest program we've seen yet. But you can do it!",
     },
     .{
         .main_file = "059_integers.zig",
@@ -339,7 +339,7 @@ const exercises = [_]Exercise{
     .{
         .main_file = "066_comptime.zig",
         .output = "Immutable: 12345, 987.654; Mutable: 54321, 456.789; Types: comptime_int, comptime_float, u32, f32",
-        .hint = "It may help to read this one out loud to your favorite stuffed animal until it sinks in completely." 
+        .hint = "It may help to read this one out loud to your favorite stuffed animal until it sinks in completely.",
     },
     .{
         .main_file = "067_comptime2.zig",