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revcomp(dna) -- return the reverse complement of a DNA string.
The given string is entirely made up of the base symbols 'A', 'C', 'G', 'T'. Return the string reversed, with each base replaced by its complement ('A' to 'T', 'C' to 'G', 'G' to 'C', 'T' to 'A').

revcomp('CAT') → 'ATG'
revcomp('GATTACA') → 'TGTAATC'
revcomp('ACGT') → 'ACGT'

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def revcomp(dna):

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