refactor: Broke comma into a separate package.

build.zig

@@ -21,6 +21,11 @@ pub fn build(b: *std.Build) void {
     // target and optimize options) will be listed when running `zig build --help`
     // in this directory.
 
+    const comma = b.addModule("comma", .{
+        .root_source_file = b.path("src/comma.zig"),
+        .target = target,
+    });
+
     // This creates a module, which represents a collection of source files alongside
     // some compilation options, such as optimization mode and linked system libraries.
     // Zig modules are the preferred way of making Zig code available to consumers.
@@ -39,6 +44,9 @@ pub fn build(b: *std.Build) void {
         // Later on we'll use this module as the root module of a test executable
         // which requires us to specify a target.
         .target = target,
+        .imports = &.{
+            .{ .name = "comma", .module = comma },
+        },
     });
 
     // Here we define an executable. An executable needs to have a root module
@@ -78,6 +86,7 @@ pub fn build(b: *std.Build) void {
                 // repeated because you are allowed to rename your imports, which
                 // can be extremely useful in case of collisions (which can happen
                 // importing modules from different packages).
+                .{ .name = "comma", .module = comma },
                 .{ .name = "envr", .module = mod },
             },
         }),