word-Char-InSentence

Create a function words_with_redundant_letters that takes as input a sentence (linked-list) and returns a sub-sentence (sub-list) of words that have two redundant consecutive letters. For instance, the following sentence: ”Anna has a good English”, the the sub-list should contain only the words Anna and good. ( assuming that English words do not contain more than two consecutive identical letters) c-style strings methods ONLY are used