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#import 
   
    NSString *replaceCharacters(NSString *input, NSDictionary *replacementMap) {    // ????????????    NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:input];        // ???????????    for (NSUInteger index = 0; index < [str length]; index++) {        // ??????        NSString *charToReplace = [str substringWithRange:NSMakeRange(index, 1)];        // ?????????        NSString *replacement = [replacementMap objectForKey:charToReplace];                // ???????????        if (replacement) {            // ????            [str replaceCharactersInRange:NSMakeRange(index, 1) withString:replacement];        }    }        return [str string];}
   

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