RadixSort fixed bug, adding test file for it
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Fix one bug; sorting doesn't work for empty array.
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Add test cases for Radix_sort.
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[x] This pull request is all my own work -- I have not plagiarized it.
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[x] I know that pull requests will not be merged if they fail the automated tests.
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[x] This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
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[x] All new Java files are placed inside an existing directory.
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[x] All filenames are in all uppercase characters with no spaces or dashes.
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[x] All functions and variable names follow Java naming conventions.
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[x] All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
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[x] If this pull request resolves one or more open issues then the commit message contains
Fixes: #{$ISSUE_NO}.