substring the repeated string a string

test 6.12.xcodeproj
...................\project.pbxproj
...................\project.xcworkspace
...................\xcuserdata
...................\..........\yanghuan.xcuserdatad
...................\..........\....................\xcdebugger
...................\..........\....................\xcschemes
...................\..........\....................\.........\test 6.12.xcscheme
...................\..........\....................\.........\xcschememanagement.plist
...................\..........\....................\..debugger\Breakpoints_v2.xcbkptlist
...................\project.xcworkspace\contents.xcworkspacedata
...................\...................\xcuserdata
...................\...................\..........\yanghuan.xcuserdatad
...................\...................\..........\....................\UserInterfaceState.xcuserstate

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