diff --git a/Makefile b/Makefile
deleted file mode 100644
index f7122df..0000000
--- a/Makefile
+++ /dev/null
@@ -1,12 +0,0 @@
-
-.PHONY: src
-
-codestyle:
-	cljfmt fix ./src
-
-lint:
-	@clj-kondo --lint src
-
-tests:
-	@make codestyle
-	@make lint
diff --git a/bb.edn b/bb.edn
index cee823b..34d058c 100644
--- a/bb.edn
+++ b/bb.edn
@@ -5,4 +5,4 @@
                   (run 'lint:kondo))
   lint:cs       (shell "cljfmt fix")
   lint:cs:check (shell "cljfmt check")
-  lint:kondo    (shell "clj-kondo --lint FourClojure")}}
+  lint:kondo    (shell "clj-kondo --lint test")}}
diff --git a/test/code_basics/p8_state_test.clj b/test/code_basics/p8_state_test.clj
index 06031ca..bff9721 100644
--- a/test/code_basics/p8_state_test.clj
+++ b/test/code_basics/p8_state_test.clj
@@ -22,7 +22,7 @@
 ; 38. https://code-basics.com/ru/languages/clojure/lessons/atoms-validation
 (defn vec-even?
   [vector]
-  (and (not (empty? vector))
+  (and (not (boolean (empty? vector)))
        (vector? vector)
        (every? even? vector)))
 
diff --git a/test/four_clojure_org/p001_10/p10_test.clj b/test/four_clojure_org/p001_10/p10_test.clj
index a002376..2b6bbc4 100644
--- a/test/four_clojure_org/p001_10/p10_test.clj
+++ b/test/four_clojure_org/p001_10/p10_test.clj
@@ -7,11 +7,11 @@
 ; functions. Commas are whitespace.
 
 (def __ (:b {:a 10
-:b 20
-:c 30}))
+             :b 20
+             :c 30}))
 
 (deftest problem-test
   (is (= __ ((hash-map :a 10, :b 20, :c 30) :b)))
   (is (= __ (:b {:a 10,
-:b 20,
-:c 30}))))
+                 :b 20,
+                 :c 30}))))
diff --git a/test/four_clojure_org/p011_20/p11_test.clj b/test/four_clojure_org/p011_20/p11_test.clj
index 2c0e626..5cb8096 100644
--- a/test/four_clojure_org/p011_20/p11_test.clj
+++ b/test/four_clojure_org/p011_20/p11_test.clj
@@ -10,5 +10,5 @@
 
 (deftest problem-test
   (is (= {:a 1,
-:b 2,
-:c 3} (conj {:a 1} __ [:c 3]))))
\ No newline at end of file
+          :b 2,
+          :c 3} (conj {:a 1} __ [:c 3]))))
\ No newline at end of file