reorganize into modules

src/empty_span.rs

@@ -0,0 +1,9 @@
+use std::borrow::Cow;
+use ratatui::{style::Style, text::Span};
+
+pub const fn empty_span() -> Span<'static> {
+	Span {
+		style: Style::new(),
+		content: Cow::Borrowed("")
+	}
+}