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#import <Foundation/Foundation.h>
@interface NSString (Extensions)
+ (NSString *)stringToSha1:(NSString *)str;
- (NSNumber*)stringToNSNumber;
- (BOOL)isEmpty;
- (BOOL)stringContainsSubString:(NSString *)subString;
- (NSString *)stringByReplacingStringsFromDictionary:(NSDictionary *)dict;