Update address.rs

src/types/address.rs

+extern crate data_encoding;
+extern crate ring;
 use serde::{Serialize, Deserialize};
 
+use ring::digest::{Context, SHA256};
+
+use data_encoding::HEXLOWER;
+
+
 // 20-byte address
 #[derive(Eq, PartialEq, Serialize, Deserialize, Clone, Hash, Default, Copy)]
 pub struct Address([u8; 20]);
@@ -48,7 +55,13 @@ impl std::fmt::Debug for Address {
 
 impl Address {
     pub fn from_public_key_bytes(bytes: &[u8]) -> Address {
-        unimplemented!()
+        let mut context = Context::new(&SHA256);
+        context.update(&bytes[..]);
+        let result =  context.finish();
+        let mut a:[u8; 20] = [0u8;20];
+        a.copy_from_slice(&(result.as_ref()[12..32]));
+        Address(a)
+        //unimplemented!()
     }
 }
 // DO NOT CHANGE THIS COMMENT, IT IS FOR AUTOGRADER. BEFORE TEST
@@ -62,6 +75,8 @@ mod test {
         let test_key = hex!("0a0b0c0d0e0f0e0d0a0b0c0d0e0f0e0d0a0b0c0d0e0f0e0d0a0b0c0d0e0f0e0d");
         let addr = Address::from_public_key_bytes(&test_key);
         let correct_addr: Address = hex!("1851a0eae0060a132cf0f64a0ffaea248de6cba0").into();
+        println!("addr:{}",addr);
+        println!("correct_addr:{}",correct_addr);
         assert_eq!(addr, correct_addr);
         // "b69566be6e1720872f73651d1851a0eae0060a132cf0f64a0ffaea248de6cba0" is the hash of
         // "0a0b0c0d0e0f0e0d0a0b0c0d0e0f0e0d0a0b0c0d0e0f0e0d0a0b0c0d0e0f0e0d"
@@ -69,4 +84,4 @@ mod test {
     }
 }
 
-// DO NOT CHANGE THIS COMMENT, IT IS FOR AUTOGRADER. AFTER TEST
\ No newline at end of file
+// DO NOT CHANGE THIS COMMENT, IT IS FOR AUTOGRADER. AFTER TEST