LeetCode-557. Reverse Words in a String III

Given a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.

Example 1:
Input: "Let's take LeetCode contest"
Output: "s'teL ekat edoCteeL tsetnoc"

Note: In the string, each word is separated by single space and there will not be any extra space in the string.

func reverseWords(_ s: String) -> String {
    let arr = s.components(separatedBy: " ")
    print(arr)
    var str = ""
    for (index, t) in arr.enumerated() {
        str.append(reverseStr(t))
        if index < arr.count-1 {
            str.append(" ")
        }
    }
    return str
}

func reverseStr(_ s: String) -> String {
    var str = ""
    for c in s.characters.reversed() {
        str.append(c)
    }
    return str
}