Create Minimum sum

Minimum sum

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+//Minimum sum
+
+import java.io.*;
+import java.lang.*;
+import java.util.*;
+
+class GFG {
+    public static void main(String args[]) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        int t = Integer.parseInt(br.readLine());
+
+        while (t-- > 0) {
+            String arr[] = br.readLine().split(" ");
+            int a[] = new int[arr.length];
+
+            for(int i = 0; i < arr.length; i++) {
+                a[i] = Integer.parseInt(arr[i]);
+            }
+
+            Solution obj = new Solution();
+            int f = 0;
+            String A = obj.minSum(a);
+            System.out.println(A);
+            System.out.println("~");
+        }
+    }
+}
+
+class Solution {
+    String minSum(int[] arr) {
+        Arrays.sort(arr);
+        StringBuilder s1 = new StringBuilder();
+        StringBuilder s2 = new StringBuilder();
+
+        for(int i = 0; i < arr.length; i++) {
+            if(i % 2 == 0) {
+                s1.append(arr[i]);
+            }
+            else {
+                s2.append(arr[i]);
+            }
+        }
+
+        return addString(s1, s2);
+    }
+
+    static String addString(StringBuilder s1, StringBuilder s2) {
+        int i = s1.length() - 1;
+        int j = s2.length() - 1;
+        int carry = 0;
+        StringBuilder res = new StringBuilder();
+
+        while(i >= 0 || j >= 0 || carry > 0) {
+            int sum = carry;
+
+            if(i >= 0) {
+                sum += (s1.charAt(i) - '0');
+            }
+            if(j >= 0) {
+                sum += (s2.charAt(j) - '0');
+            }
+
+            res.append(sum % 10);
+            carry = sum / 10;
+            i--;
+            j--;
+        }
+
+        while(res.length() > 0 && res.charAt(res.length() - 1) == '0') {
+            res.deleteCharAt(res.length() - 1);
+        }
+
+        res.reverse();
+
+        return res.toString();
+    }
+}