使用strings包方法，计算文件名

package main

import (
    "bufio"
    "fmt"
    "os"
    "strings"
)

func main() {
    input := bufio.NewScanner(os.Stdin)
    for input.Scan() {
        fmt.Println(basename(input.Text()))
    }
    // NOTE: ignoring potential errors from input.Err()
}

// basename removes directory components and a trailing .suffix.
// e.g., a => a, a.go => a, a/b/c.go => c, a/b.c.go => b.c
//!+
func basename(s string) string {
    slash := strings.LastIndex(s, "/") // -1 if "/" not found
    s = s[slash+1:]
    if dot := strings.LastIndex(s, "."); dot >= 0 {
        s = s[:dot]
    }
    return s
}