如何修剪字符串的开头和结尾空格？

例如，

package mainimport (    "fmt"    "strings")func main() {    s := "t Hello, Worldn "    fmt.Printf("%d %qn", len(s), s)    t := strings.TrimSpace(s)    fmt.Printf("%d %qn", len(t), t)}

输出：

16 "t Hello, Worldn "12 "Hello, World"