ios - Memory leak reported by instrument. Can't understand why -

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instruments telling following method leaking memory when creating mutable string. can tell me why? using arc on ios 8 xcode 6.2.

 - (nsstring *)capitalizefirstletter {         if (self.length == 0) {             return self;         }         nsmutablestring * string = [nsmutablestring stringwithstring:self.lowercasestring];         [string replacecharactersinrange:nsmakerange(0, 1) withstring:[self substringtoindex:1].capitalizedstring];         return string;     }

i not sure caused leak, if want avoid can change method to:

- (nsstring *)capitalizefirstletter {     if (self.length == 0) {         return self;     }     return [nsstring stringwithformat:@"%@%@", [self substringtoindex:1].capitalizedstring, [self substringfromindex:1]]; }

also review answeres here need fixing memory leak - nsmutablestring


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