Remove trailing whitespace.

exercises/079_quoted_identifiers.zig

@@ -22,7 +22,7 @@ const print = @import("std").debug.print;
 pub fn main() void {
     const 55_cows: i32 = 55;
     const isn't true: bool = false;
-    
+
     print("Sweet freedom: {}, {}.\n", .{
         55_cows,
         isn't true,