字符串生成hashcode

如何输入一个字符串，得到一个唯一的hashcode？

package main

import (
        "fmt"
        "hash/crc32"
)

// String hashes a string to a unique hashcode.
//
// crc32 returns a uint32, but for our use we need
// and non negative integer. Here we cast to an integer
// and invert it if the result is negative.
func String(s string) int {
        v := int(crc32.ChecksumIEEE([]byte(s)))
        if v >= 0 {
                return v
        }
        if -v >= 0 {
                return -v
        }
        // v == MinInt
        return 0
}


func main(){
        str1 := "hello world"
        str2 := "xmge.top"
        
        for _, str := range []string{str1, str2} {
            for i := 0; i < 3; i++ {
                hc := String(str)
                fmt.Println("hashcode:", hc)
            }
        }
}