package main

import (
    "os"
    "os/exec"
    "runtime"
)

func filter[T any](ss []T, test func(T) bool) (ret []T) {
    for _, s := range ss {
        if test(s) {
            ret = append(ret, s)
        }
    }
    return
}

func clearTerminal() {
    var cmd *exec.Cmd
    if runtime.GOOS == "windows" {
        cmd = exec.Command("cmd", "/c", "cls")
    } else {
        cmd = exec.Command("clear")
    }
    cmd.Stdout = os.Stdout
    cmd.Run()
}