remove 3 duplicates, move one course to kotlin section (#11595)

courses/free-courses-en.md

@@ -208,7 +208,6 @@
 ### Android
 
 * [Advanced Android App Development](https://www.udacity.com/course/advanced-android-app-development--ud855) (Udacity)
-* [Advanced Android with Kotlin](https://www.udacity.com/course/advanced-android-with-kotlin--ud940) (Udacity)
 * [Android App Development for Beginners Playlist](https://www.youtube.com/playlist?list=PL6gx4Cwl9DGBsvRxJJOzG4r4k_zLKrnxl) - Bucky Roberts (thenewboston)
 * [Android App Development Tutorial for Beginners (2020) \| Complete Guides and Courses](https://www.youtube.com/playlist?list=PLwhVruPHD9rz2MwQuYSenQ0WK1IGP5rYM) - tutorialsEU
 * [Android Basics: Data Storage](https://www.udacity.com/course/android-basics-data-storage--ud845) (Udacity)
@@ -223,18 +222,15 @@
 * [Android Development Tutorials](https://www.youtube.com/playlist?list=PLqM7alHXFySF_Hb1GtyvCX44dBniJ5sNy) -  GeeksforGeeks
 * [Android Performance](https://www.udacity.com/course/android-performance--ud825) (Udacity)
 * [Android Tutorial for Beginners](https://www.youtube.com/playlist?list=PLsyeobzWxl7p-lZvWabkVJdM_UVURhUh4) - Telusko
-* [Android with kotlin](https://www.youtube.com/playlist?list=PLlxmoA0rQ-Lw5k_QCqVl3rsoJOnb_00UV) - Smartherd
 * [Build Native Mobile Apps with Flutter](https://www.udacity.com/course/build-native-mobile-apps-with-flutter--ud905) (Udacity)
 * [CS194A Android Development](https://www.youtube.com/playlist?list=PL7NYbSE8uaBDcLkbXsQADdvBnVbavonGn) - Rahul Pandey (Stanford)
 * [CS50 2019 - Android Track](https://www.youtube.com/playlist?list=PLhQjrBD2T381qULidYDKP55-4u1piASC1) - David J. Malan (Harvard OpenCourseWare)
 * [Developing Android Apps](https://www.udacity.com/course/new-android-fundamentals--ud851) (Udacity)
-* [Developing Android Apps with Kotlin](https://www.udacity.com/course/developing-android-apps-with-kotlin--ud9012) (Udacity)
 * [Firebase Analytics: Android](https://www.udacity.com/course/firebase-analytics-android--ud354) - Steve Ganem, Todd Kerpelman, Jessica Lin, Daniel Mai (Udacity)
 * [Firebase in a Weekend: Android](https://www.udacity.com/course/firebase-in-a-weekend-by-google-android--ud0352) (Udacity)
 * [Gradle for Android and Java](https://www.udacity.com/course/gradle-for-android-and-java--ud867) (Udacity)
 * [Jetpack Compose](https://www.youtube.com/playlist?list=PLQkwcJG4YTCSpJ2NLhDTHhi6XBNfk9WiC) - Philipp Lackner
 * [Jetpack Compose for Android Developers](https://developer.android.com/courses/jetpack-compose/course) - Google Developers Training
-* [Kotlin Bootcamp for Programmers](https://www.udacity.com/course/kotlin-bootcamp-for-programmers--ud9011) (Udacity)
 * [Learn Android Application Development for Beginners](https://www.udemy.com/course/learn-android-application-development-y/) - Johan Jurrius, ProgramMe Programming (Udemy)
 * [Learn Android in 9 Hours](https://www.youtube.com/watch?v=aS__9RbCyHg) (Edureka)
 * [Material design](https://material.io/guidelines/)
@@ -1238,6 +1234,7 @@
 
 * [Advanced Android with Kotlin](https://www.udacity.com/course/advanced-android-with-kotlin--ud940) (Udacity)
 * [Android Kotlin Tutorial: Create Android Apps using Kotlin](https://www.youtube.com/playlist?list=PLlxmoA0rQ-Lw5k_QCqVl3rsoJOnb_00UV) - Sriyank Siddhartha
+* [Android with kotlin](https://www.youtube.com/playlist?list=PLlxmoA0rQ-Lw5k_QCqVl3rsoJOnb_00UV) - Smartherd
 * [Developing Android Apps with Kotlin](https://www.udacity.com/course/developing-android-apps-with-kotlin--ud9012) (Udacity)
 * [Kotlin Bootcamp for Programmers](https://www.udacity.com/course/kotlin-bootcamp-for-programmers--ud9011) - Aleks Haecky, Asser Samak, Sean McQuillan (Udacity)
 * [Kotlin Bootcamp for Programmers](https://developer.android.com/courses/kotlin-bootcamp/overview) - Developer Android (Google)