GO逆转字符串

package main

import "fmt"

func main(){
    str:="foobar"
    a:=[]rune(str)
    for i,j:=0,len(a)-1;i<j;i,j=i+1,j-1{
        a[i],a[j]=a[j],a[i]
    }
    fmt.Printf("%s\n",string(a))
}