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)
}