344. 反转字符串

双指针

package main
import "fmt"
func reverseString(s []byte)  {
    l :=0
    r :=len(s)-1
    for l<r{
        s[l],s[r] = s[r],s[l]
        l++
        r--
    }
}
func main() {
    s := []byte{'h','e','l','l','o'}
    fmt.Println(string(s))
    reverseString(s)
    fmt.Println(string(s))
}