Liikt's solution for the quiz (gophercises#21)

* my solution for the quiz

* implemented the suggestions from @arsham

students/liikt/main.go

@@ -0,0 +1,77 @@
+package main
+
+import (
+	"encoding/csv"
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+	"time"
+)
+
+var (
+	problemsFile string
+	timeout      int
+	correct      int
+	b            bool
+	inChan       chan int
+	outChan      chan int
+)
+
+func getAnswer(solution string) {
+	var inp string
+	fmt.Scanln(&inp)
+	if sanitize(inp) == sanitize(solution) {
+		outChan <- <-inChan + 1
+	} else {
+		outChan <- <-inChan
+	}
+}
+
+func updateCorrect() bool {
+	select {
+	case res := <-outChan:
+		correct = res
+		return true
+	case <-time.After(time.Duration(timeout) * time.Second):
+		close(outChan)
+		fmt.Println()
+		return false
+	}
+}
+
+func sanitize(s string) string {
+	return strings.ToLower(strings.Trim(s, "\n\r\t "))
+}
+
+func main() {
+	flag.StringVar(&problemsFile, "path", "problems.csv", "This is the flag to the CSV containing the problems for the quiz")
+	flag.IntVar(&timeout, "timeout", 30, "The amount of time you have for a single question in seconds")
+	flag.Parse()
+
+	file, err := os.Open(problemsFile)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+
+	problems, err := csv.NewReader(file).ReadAll()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	inChan, outChan = make(chan int, 1), make(chan int, 1)
+	for c, q := range problems {
+		fmt.Printf("Question %v: %v -> ", c, q[0])
+
+		go getAnswer(q[1])
+		inChan <- correct
+
+		if !updateCorrect() {
+			break
+		}
+
+	}
+	fmt.Println("You got", correct, "out of", len(problems), "correct.")
+}

students/liikt/problems.csv

@@ -0,0 +1,12 @@
+5+5,10
+1+1,2
+8+3,11
+1+2,3
+8+6,14
+3+1,4
+1+4,5
+5+1,6
+2+3,5
+3+3,6
+2+4,6
+5+2,7