diff --git a/alphanumeric.go b/alphanumeric.go
index d406140..bea70d4 100644
--- a/alphanumeric.go
+++ b/alphanumeric.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/alphanumeric_test.go b/alphanumeric_test.go
index a47fbe6..00d2107 100644
--- a/alphanumeric_test.go
+++ b/alphanumeric_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
 package checker_test
 
 import (
diff --git a/ascii.go b/ascii.go
index 17c6a76..e06c171 100644
--- a/ascii.go
+++ b/ascii.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/ascii_test.go b/ascii_test.go
index 8fb7bd1..d170b87 100644
--- a/ascii_test.go
+++ b/ascii_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
 package checker_test
 
 import (
diff --git a/checker_test.go b/checker_test.go
index 6276aec..c50b516 100644
--- a/checker_test.go
+++ b/checker_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
 //
 package checker
 
diff --git a/cidr.go b/cidr.go
index cabea12..8490dc9 100644
--- a/cidr.go
+++ b/cidr.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/cidr_test.go b/cidr_test.go
index f529df3..7b84ad7 100644
--- a/cidr_test.go
+++ b/cidr_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
 package checker_test
 
 import (
diff --git a/credit_card.go b/credit_card.go
index 4e9b5c7..a904ad2 100644
--- a/credit_card.go
+++ b/credit_card.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
 package checker
 
 import (
diff --git a/credit_card_test.go b/credit_card_test.go
index 2730650..f26e544 100644
--- a/credit_card_test.go
+++ b/credit_card_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
 package checker_test
 
 import (
diff --git a/digits.go b/digits.go
index 44864b4..ee16598 100644
--- a/digits.go
+++ b/digits.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/digits_test.go b/digits_test.go
index 232e83a..f685d5e 100644
--- a/digits_test.go
+++ b/digits_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
 package checker_test
 
 import (
diff --git a/email.go b/email.go
index 818eb6b..3856599 100644
--- a/email.go
+++ b/email.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/email_test.go b/email_test.go
index 3b5e016..67dd96e 100644
--- a/email_test.go
+++ b/email_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
 package checker_test
 
 import (
diff --git a/fqdn.go b/fqdn.go
index 05fa27f..4ba200e 100644
--- a/fqdn.go
+++ b/fqdn.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/fqdn_test.go b/fqdn_test.go
index 3b54d85..e417e01 100644
--- a/fqdn_test.go
+++ b/fqdn_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
 package checker_test
 
 import (
diff --git a/ip.go b/ip.go
index 0c7b9a2..aacef03 100644
--- a/ip.go
+++ b/ip.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/ip_test.go b/ip_test.go
index 0d1d8c4..f2fcfb3 100644
--- a/ip_test.go
+++ b/ip_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
 package checker_test
 
 import (
diff --git a/ipv4.go b/ipv4.go
index bf87e9b..54ca08c 100644
--- a/ipv4.go
+++ b/ipv4.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/ipv4_test.go b/ipv4_test.go
index bb88375..234d8b1 100644
--- a/ipv4_test.go
+++ b/ipv4_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
 package checker_test
 
 import (
diff --git a/ipv6.go b/ipv6.go
index 9ac4dd2..10edf45 100644
--- a/ipv6.go
+++ b/ipv6.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/ipv6_test.go b/ipv6_test.go
index f336f5a..7d60316 100644
--- a/ipv6_test.go
+++ b/ipv6_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
 package checker_test
 
 import (
diff --git a/isbn.go b/isbn.go
index 29d7ce4..11e50db 100644
--- a/isbn.go
+++ b/isbn.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/isbn_test.go b/isbn_test.go
index 1d8a3e1..2e2f132 100644
--- a/isbn_test.go
+++ b/isbn_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
 package checker_test
 
 import (
diff --git a/lower.go b/lower.go
index a029df7..1a8d99b 100644
--- a/lower.go
+++ b/lower.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/lower_test.go b/lower_test.go
index 9926ded..cefd630 100644
--- a/lower_test.go
+++ b/lower_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
 //
 package checker_test
 
diff --git a/luhn.go b/luhn.go
index a52e818..ef12591 100644
--- a/luhn.go
+++ b/luhn.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/luhn_test.go b/luhn_test.go
index 7940d0d..71f806c 100644
--- a/luhn_test.go
+++ b/luhn_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
 package checker_test
 
 import (
diff --git a/mac.go b/mac.go
index 7609337..56a20c2 100644
--- a/mac.go
+++ b/mac.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/mac_test.go b/mac_test.go
index be230aa..d8aed1a 100644
--- a/mac_test.go
+++ b/mac_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
 package checker_test
 
 import (
diff --git a/max.go b/max.go
index a756974..4583ae3 100644
--- a/max.go
+++ b/max.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/max_test.go b/max_test.go
index a072636..0826ef3 100644
--- a/max_test.go
+++ b/max_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
 package checker_test
 
 import (
diff --git a/maxlength.go b/maxlength.go
index 5d57798..44e28ef 100644
--- a/maxlength.go
+++ b/maxlength.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/maxlength_test.go b/maxlength_test.go
index da3fa4b..b76f5a3 100644
--- a/maxlength_test.go
+++ b/maxlength_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
 package checker_test
 
 import (
diff --git a/min.go b/min.go
index fee5684..15ea1bd 100644
--- a/min.go
+++ b/min.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/min_test.go b/min_test.go
index 0a8e4c3..8b1cad9 100644
--- a/min_test.go
+++ b/min_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
 package checker_test
 
 import (
diff --git a/minlenght.go b/minlenght.go
index 5a8641f..15f57c0 100644
--- a/minlenght.go
+++ b/minlenght.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/minlength_test.go b/minlength_test.go
index 68b10ea..00cac55 100644
--- a/minlength_test.go
+++ b/minlength_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
 package checker_test
 
 import (
diff --git a/regexp.go b/regexp.go
index ce2ec3d..5142b53 100644
--- a/regexp.go
+++ b/regexp.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/regexp_test.go b/regexp_test.go
index 7121a36..aec0840 100644
--- a/regexp_test.go
+++ b/regexp_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
 //
 package checker_test
 
diff --git a/required.go b/required.go
index d613aa3..1f06c5f 100644
--- a/required.go
+++ b/required.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import "reflect"
diff --git a/required_test.go b/required_test.go
index 677499f..0781377 100644
--- a/required_test.go
+++ b/required_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
 package checker_test
 
 import (
diff --git a/same.go b/same.go
index bb386b6..b1c1057 100644
--- a/same.go
+++ b/same.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/same_test.go b/same_test.go
index 899394b..564749d 100644
--- a/same_test.go
+++ b/same_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
 //
 package checker_test
 
diff --git a/test_helper.go b/test_helper.go
index ede5f18..ab3319f 100644
--- a/test_helper.go
+++ b/test_helper.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import "testing"
diff --git a/test_helper_test.go b/test_helper_test.go
index 60fec35..f381441 100644
--- a/test_helper_test.go
+++ b/test_helper_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
 //
 package checker_test
 
diff --git a/title.go b/title.go
index b57a0b9..68d9944 100644
--- a/title.go
+++ b/title.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/title_test.go b/title_test.go
index b545df5..31e35d8 100644
--- a/title_test.go
+++ b/title_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
 //
 package checker_test
 
diff --git a/trim.go b/trim.go
index 3dbd150..b5b9f18 100644
--- a/trim.go
+++ b/trim.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/trim_left.go b/trim_left.go
index 8c1e38d..04b7d87 100644
--- a/trim_left.go
+++ b/trim_left.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/trim_left_test.go b/trim_left_test.go
index 4d5315b..a6c5df7 100644
--- a/trim_left_test.go
+++ b/trim_left_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
 //
 package checker_test
 
diff --git a/trim_right.go b/trim_right.go
index 8fe16a4..6f0bb6c 100644
--- a/trim_right.go
+++ b/trim_right.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/trim_right_test.go b/trim_right_test.go
index 97a81a2..3fd1b55 100644
--- a/trim_right_test.go
+++ b/trim_right_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
 //
 package checker_test
 
diff --git a/trim_test.go b/trim_test.go
index 352a776..87f2a4b 100644
--- a/trim_test.go
+++ b/trim_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
 //
 package checker_test
 
diff --git a/upper.go b/upper.go
index 102a7cd..85ce3f5 100644
--- a/upper.go
+++ b/upper.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/upper_test.go b/upper_test.go
index c167f3c..3ab3342 100644
--- a/upper_test.go
+++ b/upper_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
 //
 package checker_test
 
diff --git a/url.go b/url.go
index 012bb3c..1553d2a 100644
--- a/url.go
+++ b/url.go
@@ -1,11 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved. 
-// Use of this source code is governed by a MIT-style 
-// license that can be found in the LICENSE file. 
-//
 package checker
 
 import (
diff --git a/url_test.go b/url_test.go
index 8c08b2f..644e183 100644
--- a/url_test.go
+++ b/url_test.go
@@ -1,10 +1,3 @@
-// Package checker is a Go library for validating user input through struct tags.
-//
-// https://github.com/cinar/checker
-//
-// Copyright 2023 Onur Cinar. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
 package checker_test
 
 import (