add second answer

day6/main2.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"io/ioutil"
+	"fmt"
+	"strings"
+)
+
+func main() {
+	d, _ := ioutil.ReadFile("input")
+	s := string(d)
+	//s := "abc\n\na\nb\nc\n\nab\nac\n\na\na\na\na\n\nb\n"
+	groups := strings.Split(strings.Trim(s,"\n"),"\n\n")
+	total := 0
+	for _, g := range groups {
+		results  := make(map[rune]int)
+		lines := strings.Split(g,"\n")
+		for _, l := range lines {
+			for _, c := range l {
+				if _, ok := results[c]; !ok { // if it's not already there
+					results[c] = 1
+				} else {
+					results[c] += 1
+				}
+			}
+		}
+		for q, c := range results {
+			if c != len(lines) {
+				delete(results, q)
+			}
+		}
+		fmt.Println(results)
+		total += len(results)
+	}
+	fmt.Println(total)
+}