Update DIRECTORY.md

Author: domix80

DIRECTORY.md

@@ -158,7 +158,7 @@
   * Problem 021
     * [Sol1](https://github.com/TheAlgorithms/Ruby/blob/master/project_euler/problem_021/sol1.rb)
   * Problem 022
-    * [Sol1](https://github.com/TheAlgorithms/Ruby/blob/master/project_euler/problem_022/sol1.rb)  
+    * [Sol1](https://github.com/TheAlgorithms/Ruby/blob/master/project_euler/problem_022/sol1.rb)
 
 ## Searches
   * [Binary Search](https://github.com/TheAlgorithms/Ruby/blob/master/searches/binary_search.rb)