listify.go

package main

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

func main() {
    scanner := bufio.NewScanner(os.Stdin)
    lines := make(map[string][]string)
    for scanner.Scan() {
        parts := strings.Split(scanner.Text(), ":")
        lines[parts[0]] = append(lines[parts[0]], parts[1])
    }
    
    for key := range lines {
        value := strings.Join(lines[key], ", ")
        fmt.Printf("- _%s_ line(s): %s\n", key, value);
    }
}