Merge two Strings Java

PROGRAM TO MERGE TWO STRINGS IN CHUNKS OF GIVEN SIZE

import java.io.*;

class msc {

    // Function performing calcuations

    public static void solve(String a,

                             String b, int k)

    {

        String s = "";

  

        // Length of string a

        int la = a.length();

  

        // Length f string b

        int lb = b.length();

        int l = la + lb;

  

        // Pointers for string a and string b

        int indexa = 0, indexb = 0;

        while (l > 0) {

  

            // pa and pb denote the number

            // of characters of both

            // a and b extracted

            int pa = 0, pb = 0;

  

            // If entire substring of

            // length k can be extracted

            if (la - indexa >= k) {

                s = s + a.substring(indexa, indexa + k);

                indexa = indexa + k;

                pa = k;

            }

  

            // If the remaining string is

            // of length less than k

            else if (la - indexa < k && la - indexa > 0) {

                s = s + a.substring(indexa, la);

                pa = la - indexa;

                indexa = la;

            }

  

            // If the string has been

            // traversed

            else if (indexa >= la)

                pa = 0;

  

            // If entire substring of

            // length k can be extracted

            if (lb - indexb >= k) {

                s = s + b.substring(indexb, indexb + k);

                pb = k;

                indexb = indexb + k;

            }

  

            // If the remaining string

            // is of length less than k

            else if (lb - indexb < k && lb - indexb > 0) {

                s = s + b.substring(indexb, lb);

                pb = lb - indexb;

                indexb = lb;

            }

  

            // If the string has been

            // traversed

            else if (indexb >= lb)

                pb = 0;

            l = l - pa - pb;

        }

        System.out.println(s);

    }

  

    // Driver function

    public static void main(String args[])

        throws IOException

    {

        String a = "determination", b = "stance";

        int k = 3;

        solve(a, b, k);

    }

}




OUTPUT

detstaermnceination

CREDITS: https://www.geeksforgeeks.org/merge-two-strings-chunks-given-size/