In BSStringUtilsTests rename testPracticeUsingSwiftSubstrings to testPracticeUsingSwiftSubstringFromIndex
In BSStringUtilsTests rename testPracticeUsingSwiftSubstrings to testPracticeUsingSwiftSubstringFromIndex

Add testPracticeUsingSwiftSubstringToIndex and testPracticeUsingSwiftSubstringWithRange

beepscore/ShuffleSwift