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Q1 02 Check Permutation: Added check for identical strings #202

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Q1 02 Check Permutation: Added check for identical strings #202

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gothamite
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Added equals method for identical strings.

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"If two strings are permutations, then we know they have the same characters, but in different orders" (Solutions to Chapter 1 p. 193).
In the current solution, if we use two identical strings, then the permutation method will return "true" - this is not correct

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