var _buffer bytes.Buffer  //定义缓存字符串变量
_buffer.WriteString(str1)  //拼接字符串
_buffer.WriteString(str2[0:1])   //拼接字符
_buffer.String()   //转成字符串

func StringToSenstive(value string) string {
    _value := strings.TrimSpace(value)
    _len := len(_value)
    if _len == 0 || _len == 1 {
        return value
    }
    _pamathree := _len % 3
    _quothree := _len / 3
    var _buffer bytes.Buffer
    switch _len {
    case 2:
        _buffer.WriteString(_value[0:1])
        _buffer.WriteString(symbol)
    default:
        _buffer.WriteString(_value[0:_quothree])
        for i := 0; i < _quothree; i++ {
            _buffer.WriteString(symbol)
        }
        if _pamathree == 0 { //3的整数倍
            _buffer.WriteString(_value[_len:_quothree])
        } else {
            _buffer.WriteString(_value[(2*_quothree + 1):])
        }
    }
    return _buffer.String()
}

package main
 
import (
    "fmt"
    "strings"
)
 
func main() {
    original := "Hello, World!"
    old := "World"
    new := "Go"
 
    // 使用 Replace
    replacedOnce := strings.Replace(original, old, new, 1)
    fmt.Println(replacedOnce) // 输出: Hello, Go!
 
    // 使用 ReplaceAll
    replacedAll := strings.ReplaceAll(original, old, new)
    fmt.Println(replacedAll) // 输出: Hello, Go!
}