1768. Merge Strings Alternately

Easy

You are given two strings word1 and word2. Merge the strings by adding letters in alternating order, starting with word1. If a string is longer than the other, append the additional letters onto the end of the merged string.

Return the merged string.

Example 1:

Input: word1 = "abc", word2 = "pqr"
Output:
 "apbqcr"
Explanation:
 The merged string will be merged as so:
word1:  a   b   c
word2:    p   q   r
merged: a p b q c r

Example 2:

Input: word1 = "ab", word2 = "pqrs"
Output:
 "apbqrs"
Explanation:
 Notice that as word2 is longer, "rs" is appended to the end.
word1:  a   b 
word2:    p   q   r   s
merged: a p b q   r   s

Example 3:

Input: word1 = "abcd", word2 = "pq"
Output:
 "apbqcd"
Explanation:
 Notice that as word1 is longer, "cd" is appended to the end.
word1:  a   b   c   d
word2:    p   q 
merged: a p b q c   d

Constraints:

• 1 <= word1.length, word2.length <= 100

• word1 and word2 consist of lowercase English letters.

解題

func mergeAlternately(word1 string, word2 string) string {
    index := 0
    ans := make([]byte, 0)

    for index < len(word1) || index < len(word2) {
        if index < len(word1) {
            ans = append(ans, word1[index])
        }

        if index < len(word2) {
            ans = append(ans, word2[index])
        }

        index++
    }

    return string(ans)
}