def stemmer(text):
    stemmed_string = []
    suffixes = ('ed', 'ly', 'ing')
    
    for word in text.split():
        for suffix in suffixes:
            if word.endswith(suffix):
                word = word[:-len(suffix)]
        stemmed_string.append(word)
    
    return stemmed_string

print(stemmer("I have a dog that is barking"))
print(stemmer("a fly could fling my bed"))