Calculate URL for Gravatar

gistfile1.m

static inline NSString *calculateURLForGravatar(NSString *email) {
    const char *email_str = [email UTF8String];
    unsigned char result[CC_MD5_DIGEST_LENGTH];
    CC_MD5(email_str, strlen(email_str), result);
    NSMutableString *hash = [NSMutableString stringWithString:@"http://www.gravatar.com/avatar/"];
    for (int i = 0; i < 16; i++) {
        [hash appendFormat:@"%02x", result[i]];
        
    }
    return [hash lowercaseString];
}