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Code Golf: Longest 3-character substring

Started: 1576368000, F jS, Y g:i:s A
Ends: 1576972800, F jS, Y g:i:s A
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Write a function called burrito that takes in a string and returns a contiguous substring within that string. This substring should be the longest possible substring that contains at most 3 unique characters.

>>> burrito("abcdcdfdb")
>>> burrito("mississippi")
>>> burrito("a b c b a")
" b c b "
>>> burrito("cat")

Note that the string can contain any type of character, not just letters.

If there is a tie, you can return any valid answer (no verification tests will have ambiguous input)

The string will always be non-empty

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