fix(recursion): resolve duplicate class issue for AllOccurrences

Author: PavithraSharma14

14-recursion/solutions/StringLength.java …sion/solutions/StringLengthSolution.java14-recursion/solutions/StringLength.java renamed to 14-recursion/solutions/StringLengthSolution.java 14-recursion/solutions/StringLength.java renamed to 14-recursion/solutions/StringLengthSolution.java

@@ -6,7 +6,7 @@
 Remove one character each time and count.
 */
 
-public class StringLength {
+public class StringLengthSolution {
 
     public static int length(String str) {
         if (str.length() == 0) {