simplify build.zig

build.zig

@@ -1,35 +1,16 @@
 const std = @import("std");
 
 pub fn build(b: *std.Build) void {
-    const target = b.standardTargetOptions(.{});
-    const optimize = b.standardOptimizeOption(.{});
-
-    const datetime = b.addModule("datetime", .{
-        .root_source_file = b.path("src/root.zig"),
-    });
-
-    const lib = b.addStaticLibrary(.{
-        .name = "datetime",
-        .root_source_file = b.path("src/root.zig"),
-        .target = target,
-        .optimize = optimize,
-    });
-    b.installArtifact(lib);
-
-    const lib_unit_tests = b.addTest(.{
-        .root_source_file = b.path("src/root.zig"),
-        .target = target,
-        .optimize = optimize,
-    });
+    const entry = b.path("src/root.zig");
+    const lib = b.addModule("datetime", .{ .root_source_file = entry });
+    const lib_unit_tests = b.addTest(.{ .root_source_file = entry });
     const run_lib_unit_tests = b.addRunArtifact(lib_unit_tests);
 
     const demo = b.addTest(.{
         .name = "demo",
-        .root_source_file = .{ .path = "./demos.zig" },
-        .target = target,
-        .optimize = optimize,
+        .root_source_file = b.path("demos.zig"),
     });
-    demo.root_module.addImport("datetime", datetime);
+    demo.root_module.addImport("datetime", lib);
     const run_demo = b.addRunArtifact(demo);
 
     const test_step = b.step("test", "Run unit tests");