Restyled README and file structure

Signed-off-by: Ettore Dreucci <ettore.dreucci@gmail.com>

2019/day_01/day_01.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+)
+
+func requiredFuel(mass int) int {
+	// Part 1
+	fuelReq := (mass / 3) - 2
+	// Part 2
+	if fuelReq <= 0 {
+		return 0
+	}
+	return fuelReq + requiredFuel(fuelReq)
+}
+
+func main() {
+	file, err := os.Open("./input")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+
+	var fuelReq int = 0
+
+	scan := bufio.NewScanner(file)
+
+	for scan.Scan() {
+		mass, err := strconv.Atoi(scan.Text())
+		if err != nil {
+			log.Printf("Error converting line to int: %v", err)
+		} else {
+			fuelReq += requiredFuel(mass)
+		}
+	}
+	fmt.Println(fuelReq)
+}