contacts_api | Serverless RESTful API with AWS Lambda | Serverless library

public void deleteDuplicates() {

        Node pred = head;
        // predecessor = the node
        // having sublist of its duplicates
        Node newHead = head;
        while (newHead != null) {
            // if it's a beginning of duplicates   

public int removeDuplicates(int[] nums) {
        if(nums.length == 0 || nums == null) {
            return 0;
        }

        if(nums.length < 2) {
            return nums.length;
        }
        
        int index = 1;
        
        for(  

String removeDuplicatesUsingCharArray(String str) {

        char[] chars = str.toCharArray();
        StringBuilder sb = new StringBuilder();
        int repeatedCtr;
        for (int i = 0; i < chars.length; i++) {
            repeatedCtr = 0;