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Unique In Order

Implement the function unique_in_order which takes as argument a sequence and returns a list of items without any elements with the same value next to each other and preserving the original order of elements.

For example:

unique_in_order(‘AAAABBBCCDAABBB’) == ['A', 'B', 'C', 'D', 'A', 'B']

unique_in_order(‘ABBCcAD’) == ['A', 'B', 'C', 'c', 'A', 'D']

unique_in_order([1,2,2,3,3]) == [1,2,3]

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