Format code with black, autopep8 and gofumpt

This commit fixes the style issues introduced in 34b6022 according to the output
from black, autopep8 and gofumpt.

Details: https://deepsource.io/gh/QuackatronHQ/Gigarepo/transform/2a25b4d4-e403-47de-9955-da5a65e7a67a/

go/helper_test.go

@@ -12,8 +12,8 @@ type mockHandler struct{}
 func (m mockHandler) ServeHTTP(http.ResponseWriter, *http.Request) {}
 
 func TestNewServer(t *testing.T) {
-	var addr = "127.0.0.1:8080"
-	var srv = NewServer(addr, mockHandler{})
+	addr := "127.0.0.1:8080"
+	srv := NewServer(addr, mockHandler{})
 	if !assert.Equal(t, addr, srv.Addr) {
 		t.Fail()
 	}

go/img.go

@@ -9,7 +9,7 @@ import (
 )
 
 func imageIndex(img []image.Image, find image.Image) int {
-	for i, _ := range img {
+	for i := range img {
 		if img[i] == find {
 			return i
 		}

python/tests/test_code.py

@@ -6,6 +6,7 @@ def test_random_number_generator():
     """Test random number generator."""
     assert RandomNumberGenerator().get_number()
 
+
 class Tests(unittest.TestCase):
     def my_test(self, arg1, arg2):
         self.assertEquals(arg1, arg2)

python/type_checks.py

@@ -1,6 +1,7 @@
 def greet_all(names: list[str]) -> None:
     for name in names:
-        print('Hello ' + name)
+        print("Hello " + name)
+
 
 if __name__ == "__main__":
     heights = [5.5, 6, 5.9]