fix bug in stringify

Author: jerry-lu

assignment2/assignment2.py

@@ -28,7 +28,7 @@ def generate_sentence(counts, context, length=10) -> list:
 
 
 def stringify(sentence) -> list:
- return " ".join(" ".join(gram) for gram in sentence)
+ return " ".join("".join(gram[0]) for gram in sentence)
 
 
 if __name__ == '__main__':