added end of song detection

app.py

@@ -54,6 +54,8 @@ if st.button("Submit"):
         if line.startswith("["):
             st.markdown(f"**{line}**")
             continue
+        elif line.strip() == "<END_OF_SONG>":
+            break
         st.write(line)
 
 evaluator_title = st.title("Lyric Evaluator")