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extern crate regex;
extern crate crypto;
use std::i64;
use regex::Regex;
use self::crypto::digest::Digest;
use self::crypto::sha3::Sha3;
pub fn checksum(address: &str) -> String {
let re = Regex::new(r"^0x").unwrap();
let address = address.to_lowercase();
let address = re.replace_all(&address, "").to_string();
let mut checksum_address = "0x".to_string();
let mut hasher = Sha3::keccak256();
hasher.input_str(&address);
let address_hash = hasher.result_str();
for i in 0..address.len() {
let n = i64::from_str_radix(&address_hash.chars().nth(i).unwrap().to_string(), 16).unwrap();
let ch = address.chars().nth(i).unwrap();
if n > 7 {
checksum_address = format!("{}{}", checksum_address, ch.to_uppercase().to_string());
} else {
checksum_address = format!("{}{}", checksum_address, ch.to_string());
}
}
return checksum_address;
}