day1 and 2 done & setup for day3

2021/day1/main.go

@@ -1,7 +1,58 @@
 package main
 
-import "fmt"
+import (
+	"fmt"
+)
 
 func main() {
-	fmt.Println("hallo")
+	data := LoadData("./data")
+	c := CountIncreases(&data)
+	fmt.Println(c)
+	data = MutateDataPart2(data)
+	c = CountIncreases(&data)
+	fmt.Println(c)
+}
+
+func MutateDataPart2(data []DataEntry) []DataEntry {
+	var result []DataEntry
+	lastInt := 0
+	for i := range data {
+		if i >= len(data)-2 {
+			continue
+		}
+		value := data[i].Value + data[i+1].Value + data[i+2].Value
+		var status Status
+		switch {
+		case lastInt == 0:
+			status = Nothing
+		case lastInt < value:
+			status = Increased
+		case lastInt > value:
+			status = Decreased
+		case lastInt == value:
+			status = Equal
+		}
+		lastInt = value
+		result = append(result, DataEntry{
+			Value:  value,
+			Status: status,
+		})
+	}
+	return result
+}
+
+func CountIncreases(d *[]DataEntry) int {
+	var count int
+	for _, d := range *d {
+		if d.Status == Increased {
+			count++
+		}
+	}
+	return count
+}
+
+func checkErr(err error) {
+	if err != nil {
+		fmt.Println(err)
+	}
 }