CharacterAtIndex method?

[Richard S. French]

I am receiving a compiler warning: ³NSString may not respond to
­characterAtIndex² from the following code.
This is from MathPaper ­ Chapter 12 of Building Cocoa Apps. Any help is
appreciated.
Thanks.

- (void)appendString:(NSString *)string
{
    int i;
    
    for (i=0;i<[string length];i++) {
        unichar c = [string characterAtindex:i];
        
        switch(c) {
            case '\n':
            case  '{':
            case  '}':
            case '\\':
                [self appendChar:'\\'];
                break;
            default:
                break;
        }
        [self appendChar:c];
    }
}

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