golang語言實現讀取csv檔案內容，把相同的內容提取到另外一個檔案

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package mainimport ("encoding/csv""fmt""io""os""path/filepath""strconv")func CheckErr(err error) {if nil != err {panic(err)}}func GetFullPath(path string) string {absolutePath, _ := filepath.Abs(path)return absolutePath}func WriteFile(content []string) {f, err := os.OpenFile("sameName.csv", os.O_APPEND|os.O_CREATE, os.ModeAppend)CheckErr(err)defer f.Close()f.WriteString("\xEF\xBB\xBF")writer := csv.NewWriter(f)writer.Write(content)writer.Flush()}var exsit []string = []string{}func Exsit(name string) bool {size := len(exsit)for i := 0; i < size; i++ {if exsit[i] == name {return true}}return false}func findSame(path string) {fullPath := GetFullPath(path)records := getStrings(fullPath)size := len(records)for i := 0; i < size; i++ {rec := records[i]recNoDate := rec[:len(rec)-19]flag := 1for i2 := i + 1; i2 < size; i2++ {if recNoDate == records[i2][:len(records[i2])-19] && !Exsit(recNoDate) {WriteFile([]string{strconv.Itoa(flag), records[i2]})flag++}}if flag > 1 && !Exsit(recNoDate) {exsit = append(exsit, recNoDate)WriteFile([]string{strconv.Itoa(flag), rec})}}size = len(exsit)f, err := os.OpenFile("debug.csv", os.O_APPEND|os.O_CREATE, os.ModeAppend)CheckErr(err)defer f.Close()f.WriteString("\xEF\xBB\xBF")writer := csv.NewWriter(f)for i := 0; i < size; i++ {writer.Write([]string{exsit[i]})}writer.Flush()}func getStrings(path string) []string {f, err := os.Open(path)CheckErr(err)defer f.Close()records := []string{}reader := csv.NewReader(f)record := []string{}for {record, err = reader.Read()if err == io.EOF {break} else if nil != err {fmt.Println(err)return nil}records = append(records, record[0])}return records}func main() {var path stringif len(os.Args) > 1 {path = os.Args[1]} else {path, _ = os.Getwd()}findSame(path)fmt.Println("done!")}