You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: counting_hyperloglog.rs
    path of file: ./repos/OxidSQL/src/statistics
    
    the code of the file until where you have to start completion: 

/*
    Byte-Serializable implementation of a "counting HyperLogLog" sketch. A HyperLogLog sketch is a probabilistic
    data structure that can be used to estimate the number of distinct values in a set. This implementation 
    is based on this paper: https://db.in.tum.de/~freitag/papers/p23-freitag-cidr19.pdf which is a modified
    version of the original HyperLogLog algorithm that allows for online updates and deletes.

    You have 64 buckets that you hash the values into using the first 5
    
    pub fn delete(&self, hash: u64) {
        let bucket = (hash >> 58) as usize;
        let rest_hash = (hash << 6) >> 6;
        let leading_zeros = rest_hash.leading_zeros() - 6;
        let bucket = &self.buckets[bucket];
        let counter = &bucket[leading_zeros as usize];
        let _ = counter.fetch_update(Relaxed, Relaxed, |c| {
            if c <= 128 {
                Some(c - 1)
            } else {
                if c > 0 && (self.random)(1.0 / (2.0f64.powi((c - 128) as i32))) {
                    Some(c - 1)
                } else {
                    None
                }
            }
        });    }