iOS: Issue with ampersand in the URL string

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Or even shorter:

@implementation NSString (Escaping)
- (NSString*)stringWithPercentEscape {            
    return [(NSString *) CFURLCreateStringByAddingPercentEscapes(
        NULL, 
        (CFStringRef)[[self mutableCopy] autorelease], 
        NULL, 
        CFSTR("=,!$&'()*+;@?\n\"<>#\t :/"),
        kCFStringEncodingUTF8) autorelease];
}
@end

And here it is again as an ARC conform inline function helper:

#if __has_feature(objc_arc)
static inline NSString *hxURLEscape(NSString *v) {
    static CFStringRef _hxURLEscapeChars = CFSTR("=,!$&'()*+;@?\r\n\"<>#\t :/");
    return ((__bridge_transfer NSString *)CFURLCreateStringByAddingPercentEscapes(
        NULL, 
        (__bridge CFStringRef)[v mutableCopy], 
        NULL, 
        _hxURLEscapeChars, 
        kCFStringEncodingUTF8));
}
#endif

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