Add 2019 puzzle

Author: garritfra

2019/1/first/go.mod

@@ -0,0 +1,3 @@
+module github.com/garritfra/adventofcode2019/1
+
+go 1.15

2019/1/first/input.txt

@@ -0,0 +1,100 @@
+86608
+97271
+51200
+149104
+86406
+97844
+74380
+125817
+56605
+125891
+63835
+131033
+142276
+126174
+78742
+113961
+126933
+105209
+116007
+88301
+89203
+109951
+100609
+68863
+106611
+86765
+50887
+80834
+126291
+87119
+137577
+123005
+135688
+66530
+106270
+94168
+92881
+51170
+59598
+60445
+71249
+86492
+141475
+137397
+149715
+99862
+144797
+135188
+133640
+96909
+85245
+107849
+126123
+112848
+76667
+112760
+121517
+75878
+82591
+116926
+56514
+131864
+148794
+139636
+106349
+76418
+83862
+142732
+139332
+142236
+108925
+130420
+59682
+72933
+50265
+99444
+52089
+57686
+75440
+51043
+149777
+108662
+146667
+90802
+147235
+91776
+76203
+67766
+68173
+103707
+54682
+145674
+135349
+58766
+92270
+126388
+111236
+69184
+66915
+117342

2019/1/first/main.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"math"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	data, err := ioutil.ReadFile("input.txt")
+	if err != nil {
+		fmt.Println("File reading error", err)
+		return
+	}
+	lines := strings.Split(string(data), "\n")
+
+	sum := 0.0
+
+	for _, line := range lines {
+		fuel, _ := strconv.Atoi(line)
+		result := math.Floor(float64(fuel)/3) - 2
+		sum += result
+	}
+
+	fmt.Println(int(sum))
+}