fix issue #50

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "uniswap-sdk-core"
-version = "0.19.0"
+version = "0.20.0"
 edition = "2021"
 authors = ["malik <[email protected]>", "Shuhui Luo <twitter.com/aureliano_law>"]
 description = "The Uniswap SDK Core in Rust provides essential functionality for interacting with the Uniswap decentralized exchange"

README.md

@@ -17,7 +17,7 @@ Add this to your Cargo.toml
 
 ```
 [dependencies]
-uniswap-sdk-core = "0.19.0";
+uniswap-sdk-core = "0.20.0";
 ```
 
 And this to your code:
@@ -28,21 +28,58 @@ use uniswap_sdk_core::prelude::*;
 
 ## Examples
 
-The code below shows an example of how you can validate an address
+The code below shows an example of how to create a new `Token` instance for the DAI token on the Ethereum Mainnet using
+the `token!` macro.
 
-```
-// The `prelude` module provides a convenient way to import a number
-// of common dependencies at once. This can be useful if you are working
-// with multiple parts of the library and want to avoid having
-// to import each dependency individually.
+```rust
+// The `prelude` module provides a convenient way to import a number of common dependencies at 
+// once. This can be useful if you are working with multiple parts of the library and want to avoid
+// having to import each dependency individually.
+// Import necessary preludes and types
 use uniswap_sdk_core::prelude::*;
 
 fn main() {
-        let valid_address: &str = "0x1234567890123456789012345678901234567890";
-        assert!(check_valid_ethereum_address(valid_address).is_ok());
+    // Define the chain ID, address, decimals, symbol, and name for the token
+    const CHAIN_ID: u64 = 1; // Ethereum Mainnet
+    const TOKEN_ADDRESS: &str = "0x6B175474E89094C44Da98b954EedeAC495271d0F"; // DAI Token Address
+    const DECIMALS: u8 = 18;
+    const SYMBOL: &str = "DAI";
+    const NAME: &str = "Dai Stablecoin";
+
+    // Use the `token!` macro to create a new `Token` instance
+    let dai_token = token!(CHAIN_ID, TOKEN_ADDRESS, DECIMALS, SYMBOL, NAME);
+
+    // Example usage of the `Token` methods
+    println!("Token Address: {}", dai_token.address());
+    println!("Is Native: {}", dai_token.is_native());
+
+    // Example of comparing two tokens
+    let another_dai_token = token!(CHAIN_ID, TOKEN_ADDRESS, DECIMALS, SYMBOL, NAME);
+    println!("Are the tokens equal? {}", dai_token.equals(&another_dai_token));
+
+    // Example of sorting tokens
+    let another_token = token!(CHAIN_ID, "0x0000000000000000000000000000000000000002", DECIMALS, "ETH", "Ethereum");
+    match dai_token.sorts_before(&another_token) {
+        Ok(true) => println!("DAI sorts before ETH"),
+        Ok(false) => println!("DAI does not sort before ETH"),
+        Err(e) => println!("Error comparing tokens: {:?}", e),
+    }
 }
 ```
 
+This example demonstrates how to create a Token instance for DAI on the Ethereum Mainnet using the token! macro.
+
+It then prints the token's address and checks if it's a native token (which it isn't, so it prints false).
+
+It also compares the DAI token with another DAI token instance to show that two instances of the same token are
+considered equal.
+
+Finally, it attempts to sort the DAI token before an Ethereum token, which should print that DAI sorts before ETH,
+assuming the addresses are correctly set up for this comparison.
+
+Remember to replace "0x6B175474E89094C44Da98b954EedeAC495271d0F" with the actual address of the DAI token you're working
+with, and adjust the CHAIN_ID if you're working on a different network (e.g., a testnet).
+
 ## License
 
 This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.

src/utils/sqrt.rs

@@ -7,6 +7,8 @@ use crate::prelude::*;
 /// * `value`: the value for which to compute the square root, rounded down
 ///
 /// returns: BigInt
+
+#[allow(clippy::assigning_clones)]
 pub fn sqrt(value: &BigInt) -> Result<BigInt, Error> {
     if !value >= Zero::zero() {
         return Err(Error::Incorrect());