Add CI pipeline for variant 5

ci_lab/text_tools.py

@@ -0,0 +1,16 @@
+"""Text helper functions."""
+
+def normalize_text(text: str) -> str:
+    return " ".join(text.lower().split())
+
+def word_count(text: str) -> int:
+    normalized = normalize_text(text)
+    if not normalized:
+        return 0
+    return len(normalized.split(" "))
+
+def unique_words(text: str) -> set[str]:
+    normalized = normalize_text(text)
+    if not normalized:
+        return set()
+    return set(normalized.split(" "))