Apply zig fmt to exercises

exercises/03_assignment.zig

@@ -24,7 +24,7 @@
 //     const bar: u16 = 2000;
 //
 // You can do just about any combination of these that you can think of:
-// 
+//
 //     u32 can hold 0 to 4,294,967,295
 //     i64 can hold −9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
 //
@@ -47,5 +47,5 @@ pub fn main() void {
     // is a string. The string may contain placeholders '{}', and the
     // second parameter is an "anonymous list literal" (don't worry
     // about this for now!) with the values to be printed.
-    std.debug.print("{} {} {}\n", .{n, pi, negative_eleven});
+    std.debug.print("{} {} {}\n", .{ n, pi, negative_eleven });
 }