Update the coding style for Zig (#336)

* Update the coding style for Zig

* Update array.rs

codes/zig/chapter_stack_and_queue/stack.zig

@@ -39,6 +39,5 @@ pub fn main() !void {
     var empty = if (stack.items.len == 0) true else false;
     std.debug.print("\n栈是否为空 = {}", .{empty});
 
-    const getchar = try std.io.getStdIn().reader().readByte();
-    _ = getchar;
+    _ = try std.io.getStdIn().reader().readByte();
 }