Create functions to remove common stopwords, perform stemming on the cleaned token,lemmatization on the cleaned tokens

I have an assignment about Twitter/API using Python. The idea is to record the tweets and cleaning text from URL / Retweets and so on. I have it partially done but I need help in these things:
1-Write a function to tokenized the cleaned text. Remove common stop words
and tokens less than 3 characters long from the resulting tokens.The
function’s output should be the filtered set of tokens.
2-Write a function to perform stemming on the cleaned tokens.
3-. Also, write a separate function to perform lemmatization on the cleaned
tokens (not stemmed tokens).

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