Update exercise-21.md

Fixed typo
comp-think · Dec 19, 2022 · 5eb07a8 · 5eb07a8
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 ## Development - Beginner, exercise 21
 
 ### Text
-Write down a small function in Python that takes in input two strings and returns the number of of characters the two strings have in common.
+Write down a small function in Python that takes in input two strings and returns the number of characters the two strings have in common.
 
 ### Solution
 ```python