Add clippy error and fail test

Author: lumisce

src/lib.rs

@@ -5,7 +5,8 @@ pub fn multiply(a: i32, b: i32) -> i32 {
 
 /// Divides two integers
 pub fn divide(a: i32, b: i32) -> i32 {
-    let a = a / 1;
+    let a = a % 1;
+    let b = b / 1;
     a / b
 }