Add text cleaning function to preprocess text

Author: Pragya-19

nlp_model/text_preprocessor.py

@@ -0,0 +1,7 @@
+import re
+
+
+def clean_text(text):
+    text = text.lower()
+    text = re.sub(r"[^a-z\s]", "", text)  # remove special chars
+    return text