MergeAlternately.java

package LeetcodePractice;
public class MergeAlternately {
    public static String mergeAlternately(String word1, String word2) {
        StringBuilder result = new StringBuilder();
        int i = 0, j = 0;

        while (i < word1.length() && j < word2.length()) {
            result.append(word1.charAt(i++));
            result.append(word2.charAt(j++));
        }
     
        while (i < word1.length()) {
            result.append(word1.charAt(i++));
        }
        while (j < word2.length()) {
            result.append(word2.charAt(j++));
        }

        return result.toString();
    }

    public static void main(String[] args) {
        
        System.out.println(mergeAlternately("abc", "pqr"));  
        System.out.println(mergeAlternately("ab", "pqrs"));  
        System.out.println(mergeAlternately("abcd", "pq"));  
    }
    
}