Did something i forgot :)

hw7/task1/Cargo.toml

 
 [dependencies]
 sha2 = "0.7.0"
+clap = "2.28"
+time = "0.1"

hw7/task1/src/hash256.rs

 }
 
 pub fn verify_product(base: usize, number: usize, difficulty: String) -> Option<Solution> {
-    if let x = hasher_sha256::Hasher::hash(i32::from(base * number).as_bytes().hex().ends_with(difficulty)) {
+    if let x = hasher_sha256::Hasher::hash(((base * number) as i32)).hex().ends_with(difficulty) {
         Some(Solution{ number: (base * number), hash: x,});
     }
     None