Galaxy-brained newline intersperse function

Itertools already has an intersperse method for me. Why would I build my
own when I can do this? There's even a `fold()` over the units that come
out of the print routine.

Cargo.toml

@@ -6,6 +6,7 @@ edition = "2024"
 [dependencies]
 clap = { version = "4.0.7", features = ["derive", "env"] }
 colored = "2.0.0"
+itertools = "0.10.0"
 reqwest = { version = "0.11.13", features = ["json", "stream", "multipart"] }
 serde = { version = "1.0.152", features = ["derive"] }
 tokio = { version = "1.24.2", features = ["macros", "rt-multi-thread"] }