Update README.md

Author: Deepali-Srivastava

trees/README.md

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 # Data Structures and Algorithms in C
 
-This [“Data Structures and Algorithms in C”]( https://www.udemy.com/course/data-structures-and-algorithms-in-c/?couponCode=GITHUBSTUDENT ) repository is for the students of my online course available on Udemy. It contains the source code of all the programs used in the course. 
+This [“Data Structures and Algorithms in C”](https://coursegalaxy.newzenler.com/courses/data-structures-algorithms-c-masterclass?coupon=GITHUB50) repository is for the students of my online course available on Udemy. It contains the source code of all the programs used in the course. 
 
 ### About the Course
  * Thoroughly detailed course with complete working programs
@@ -12,6 +12,12 @@ This [“Data Structures and Algorithms in C”]( https://www.udemy.com/course/d
 
 ### Courses by [Deepali Srivastava](https://www.udemy.com/user/deepalisrivastava/)
 
+[![data-structures-algorithms-c](https://user-images.githubusercontent.com/96913690/200234592-25d33957-0e9e-4cc0-b324-2a73325aca85.jpg)](https://coursegalaxy.newzenler.com/courses/data-structures-algorithms-c-masterclass?coupon=GITHUB50)
+[![data-structures-algorithms-python](https://user-images.githubusercontent.com/96913690/200234827-86aec10a-bfab-4371-91fc-e2be855ff1ff.jpg)](https://coursegalaxy.newzenler.com/courses/data-structures-algorithms-python-masterclass?coupon=GITHUB50)
+[![data-structures-algorithms-java](https://user-images.githubusercontent.com/96913690/200234744-14a5ed97-085f-44f3-9298-979c2053c580.jpg)](https://coursegalaxy.newzenler.com/courses/data-structures-algorithms-java-masterclass?coupon=GITHUB50)
+[![data-structures-algorithms-csharp](https://user-images.githubusercontent.com/96913690/200234905-67b85dfd-20c4-4f4b-afd2-e10d3568fff8.jpg)](https://coursegalaxy.newzenler.com/courses/data-structures-algorithms-csharp-masterclass?coupon=GITHUB50)
+
+<!---
 [![data-structures-and-algorithms-in-c](https://user-images.githubusercontent.com/98641125/153195841-209d2615-ed5f-4007-ae54-539ac3c1538a.png)]( https://www.udemy.com/course/data-structures-and-algorithms-in-c/?couponCode=GITHUBSTUDENT)
 [![data-structures- and-algorithms-in-c-2](https://user-images.githubusercontent.com/98641125/153195975-d359113b-ff13-4aaa-9f06-6f600c0ddc69.png)]( https://www.udemy.com/course/data-structures-and-algorithms-in-c-2/?couponCode=GITHUBSTUDENT)
 [![data-structures- and-algorithms-in-csharp](https://user-images.githubusercontent.com/98641125/153196407-99441e67-24a7-4fa0-aaea-78cb39743282.png)]( https://www.udemy.com/course/data-structures-and-algorithms-in-csharp/?couponCode=GITHUBSTUDENT)
@@ -20,6 +26,7 @@ This [“Data Structures and Algorithms in C”]( https://www.udemy.com/course/d
 [![C-programming-in-depth](https://user-images.githubusercontent.com/98641125/153196166-45ef8461-adb1-4f9f-b9ee-e482a5ad54a7.png)]( https://www.udemy.com/course/C-programming-in-depth/?couponCode=GITHUBSTUDENT)
 [![data-structures- and-algorithms-in-c-plus-plus](https://user-images.githubusercontent.com/98641125/153196522-2412c993-1055-4322-8487-4133537566c9.png)]( https://www.udemy.com/course/data-structures-and-algorithms-in-c-plus-plus/?couponCode=GITHUBSTUDENT)
 [![data-structures- and-algorithms-in-python](https://user-images.githubusercontent.com/98641125/153196027-592d0307-5130-444f-8527-802634b5cc1e.png)]( https://www.udemy.com/course/data-structures-algorithms-in-python/?couponCode=GITHUBSTUDENT)
+--->
 
 ## Copyright
 © Copyright Deepali Srivastava : All rights reserved.