- (NSString *)stringByReversed:(NSString *)str
{
NSMutableString *mutableSgtr = [[NSMutableString alloc]init];
for (NSInteger i = str.length; i>0; i--) {
[mutableSgtr appendString:[str substringWithRange:NSMakeRange(i-1, 1)]];
}
return mutableSgtr;
}
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