Merge pull request #2713 from Aakriti-malla/main

Author: aakhtar3

Diff for: java/1768-merge-strings-alternately.java

@@ -0,0 +1,23 @@
+class Solution {
+    public String mergeAlternately(String word1, String word2) {
+        int i = 0;
+        StringBuilder res = new StringBuilder();
+
+        while (i < word1.length() || i < word2.length()) {
+            if (i < word1.length()) {
+                res.append(word1.charAt(i));
+            }
+            if (i < word2.length()) {
+                res.append(word2.charAt(i));
+            }
+            i++;
+        }
+
+        return res.toString();
+    }
+}
+
+/**
+ * Time Complexity : O(n+m)
+ * Space Complexity : O(n+m)
+ */