feat: update main

test01/src/main.zig

@@ -1,5 +1,12 @@
 const std = @import("std");
+const warn = std.debug.warn;
+//const json = std.json;
 
 pub fn main() anyerror!void {
-    std.debug.warn("Hello world.\n", .{});
+//    const stdout = std.io.getStdOut().writer();
+
+//    const name = "Hatter";
+//    warn("Hello {}", name);
+//    try stdout.print("Hello, {s}!\n", .{"world"});
+    warn("Hello world.\n", .{});
 }