Create a function manipulate_data that does the following
Accepts as the first parameter a string specifying the data structure to be
used "list", "set" or "dictionary"
Accepts as the second parameter the data to be manipulated based on the data
structure specified e.g [1, 4, 9, 16, 25] for a list data structure
Based off the first parameter
return the reverse of a list or
add items `"ANDELA"`, `"TIA"` and `"AFRICA"` to the set and return the
resulting set
return the keys of a dictionary.
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