diff --git a/io/kotlinstudy/tour/HelloWorld.kt b/kotlinstudy/tour/HelloWorld.kt
similarity index 61%
rename from io/kotlinstudy/tour/HelloWorld.kt
rename to kotlinstudy/tour/HelloWorld.kt
index d133a45..cc2d8db 100644
--- a/io/kotlinstudy/tour/HelloWorld.kt
+++ b/kotlinstudy/tour/HelloWorld.kt
@@ -1,4 +1,4 @@
-package io.kotlinstudy.tour
+package kotlinstudy.tour
 
 fun main() {
     println("Hello, Kotlin")
diff --git a/io/kotlinstudy/tour/Practice.kt b/kotlinstudy/tour/Practice.kt
similarity index 76%
rename from io/kotlinstudy/tour/Practice.kt
rename to kotlinstudy/tour/Practice.kt
index 8c21ec9..8a6b665 100644
--- a/io/kotlinstudy/tour/Practice.kt
+++ b/kotlinstudy/tour/Practice.kt
@@ -1,4 +1,4 @@
-package io.kotlinstudy.tour
+package kotlinstudy.tour
 
 fun main() {
     val name = "Mary"
diff --git a/io/kotlinstudy/tour/StringTemplates.kt b/kotlinstudy/tour/StringTemplates.kt
similarity index 83%
rename from io/kotlinstudy/tour/StringTemplates.kt
rename to kotlinstudy/tour/StringTemplates.kt
index 94a6330..2e1e3df 100644
--- a/io/kotlinstudy/tour/StringTemplates.kt
+++ b/kotlinstudy/tour/StringTemplates.kt
@@ -1,4 +1,4 @@
-package io.kotlinstudy.tour
+package kotlinstudy.tour
 
 fun main() {
     val customers = 10
diff --git a/io/kotlinstudy/tour/Variables.kt b/kotlinstudy/tour/Variables.kt
similarity index 80%
rename from io/kotlinstudy/tour/Variables.kt
rename to kotlinstudy/tour/Variables.kt
index af3e13c..67a7027 100644
--- a/io/kotlinstudy/tour/Variables.kt
+++ b/kotlinstudy/tour/Variables.kt
@@ -1,4 +1,4 @@
-package io.kotlinstudy.tour
+package kotlinstudy.tour
 
 fun main() {
     val popcorn = 5
diff --git a/io/kotlinstudy/types/BasicTypes.kt b/kotlinstudy/types/BasicTypes.kt
similarity index 93%
rename from io/kotlinstudy/types/BasicTypes.kt
rename to kotlinstudy/types/BasicTypes.kt
index 0d8ce42..f29f732 100644
--- a/io/kotlinstudy/types/BasicTypes.kt
+++ b/kotlinstudy/types/BasicTypes.kt
@@ -1,4 +1,4 @@
-package io.kotlinstudy.types
+package kotlinstudy.types
 
 fun main() {
     var customers = 10
diff --git a/io/kotlinstudy/types/Declare.kt b/kotlinstudy/types/Declare.kt
similarity index 90%
rename from io/kotlinstudy/types/Declare.kt
rename to kotlinstudy/types/Declare.kt
index f497358..8431917 100644
--- a/io/kotlinstudy/types/Declare.kt
+++ b/kotlinstudy/types/Declare.kt
@@ -1,4 +1,4 @@
-package io.kotlinstudy.types
+package kotlinstudy.types
 
 fun main() {
     val a: Int = 1000
diff --git a/io/kotlinstudy/types/Error.kt b/kotlinstudy/types/Error.kt
similarity index 62%
rename from io/kotlinstudy/types/Error.kt
rename to kotlinstudy/types/Error.kt
index 74e261a..36a6e6c 100644
--- a/io/kotlinstudy/types/Error.kt
+++ b/kotlinstudy/types/Error.kt
@@ -1,4 +1,4 @@
-package io.kotlinstudy.types
+package kotlinstudy.types
 
 fun main() {
     val d: Int
diff --git a/io/kotlinstudy/types/SpecifyType.kt b/kotlinstudy/types/SpecifyType.kt
similarity index 77%
rename from io/kotlinstudy/types/SpecifyType.kt
rename to kotlinstudy/types/SpecifyType.kt
index d733066..f2494d2 100644
--- a/io/kotlinstudy/types/SpecifyType.kt
+++ b/kotlinstudy/types/SpecifyType.kt
@@ -1,4 +1,4 @@
-package io.kotlinstudy.types
+package kotlinstudy.types
 
 fun main() {
     val d: Int