Golang之字符串反转

package main

import "fmt"

func reverse(str string) string {
    var result string
    strLen := len(str)
    for i := 0; i < strLen; i++ {
        result = result + fmt.Sprintf("%c", str[strLen-i-1])
    }
    return result
}
func reverse1(str string) string {
    var result []byte
    tmp := []byte(str)
    length := len(str)
    for i := 0; i < length; i++ {
        result = append(result, tmp[length-i-1])
    }
    return string(result)
}
func main() {
    var str1 = "hello"
    str2 := "world"
    str3 := fmt.Sprintf("%s %s", str1, str2)
    n := len(str3)
    fmt.Println(str3)
    fmt.Printf("len(str3)=%d\n", n)
    substr := str3[0:5]
    fmt.Println(substr)
    substr = str3[6:]
    fmt.Println(substr)
    result := reverse(str3)
    fmt.Println(result)
    result = reverse1(result)
    fmt.Println(result)

}