Split util into own package

build.zig

@@ -1,5 +1,9 @@
 const std = @import("std");
 
+const static_libs = [_][]const u8{
+    "util",
+};
+
 pub fn build(b: *std.build.Builder) void {
     // Standard target options allows the person running `zig build` to choose
     // what target to build for. Here we do not override the defaults, which
@@ -11,9 +15,15 @@ pub fn build(b: *std.build.Builder) void {
     // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall.
     const mode = b.standardReleaseOptions();
 
-    const exe = b.addExecutable("apub", "src/main.zig");
+    const exe = b.addExecutable("apub", "src/main/main.zig");
     exe.setTarget(target);
     exe.setBuildMode(mode);
+
+    inline for (static_libs) |name| {
+        const lib = b.addStaticLibrary(name, "src/" ++ name ++ "/lib.zig");
+        exe.linkLibrary(lib);
+    }
+
     exe.install();
 
     const run_cmd = exe.run();