Add use unichar init NSString.
Add use unichar init NSString.

Ju2ender/Objective-C-Exercise,Ju2ender/Objective-C-Exercise,Ju2ender/Objective-C-Exercise,Ju2ender/Objective-C-Exercise,Ju2ender/Objective-C-Exercise,Ju2ender/Objective-C-Exercise,Ju2ender/Objective-C-Exercise,Ju2ender/Objective-C-Exercise,Ju2ender/Objective-C-Exercise