Day 8b complete

Struggled with this challenge as well, had to consult the forums in order to get my head around it 😞

day8/day 8b/go.mod

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+module PWD
+
+go 1.17

day8/day 8b/main.go

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+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+func main() {
+	content := returnContent("../input")
+	//content := returnContent("testInput")
+
+	//Assisted Solution
+
+	/*struggled quite a bit on this challenge,
+	looked at a pre-comepleted solution in order
+	to get a valid answer */
+
+	sum := 0
+
+	for _, line := range *content {
+		split := strings.Split(line, " | ")
+
+		lhs := split[0]
+		rhs := split[1]
+
+		lhsDigits := strings.Fields(lhs)
+		rhsDigits := strings.Fields(rhs)
+
+		one := ""
+		four := ""
+		seven := ""
+		eight := ""
+		var len5 []string
+		var len6 []string
+		for _, digit := range lhsDigits {
+			switch len(digit) {
+			case 2:
+				one = digit
+			case 4:
+				four = digit
+			case 3:
+				seven = digit
+			case 7:
+				eight = digit
+			case 5:
+				len5 = append(len5, digit)
+			case 6:
+				len6 = append(len6, digit)
+			}
+		}
+
+		zero := ""
+		six := ""
+		nine := ""
+		for _, digit := range len6 {
+			switch inCommon(digit, four) {
+			case 4:
+				nine = digit
+			case 3:
+				if inCommon(digit, seven) == 3 {
+					zero = digit
+				} else {
+					six = digit
+				}
+			}
+		}
+
+		two := ""
+		three := ""
+		five := ""
+		for _, digit := range len5 {
+			if inCommon(digit, nine) == 5 {
+				if inCommon(digit, seven) == 3 {
+					three = digit
+				} else {
+					five = digit
+				}
+			} else {
+				two = digit
+			}
+		}
+
+		var answerDigits [4]int
+		for i, digit := range rhsDigits {
+			if len(digit) == 6 && inCommon(digit, zero) == 6 {
+				answerDigits[i] = 0
+			} else if len(digit) == 2 && inCommon(digit, one) == 2 {
+				answerDigits[i] = 1
+			} else if len(digit) == 5 && inCommon(digit, two) == 5 {
+				answerDigits[i] = 2
+			} else if len(digit) == 5 && inCommon(digit, three) == 5 {
+				answerDigits[i] = 3
+			} else if len(digit) == 4 && inCommon(digit, four) == 4 {
+				answerDigits[i] = 4
+			} else if len(digit) == 5 && inCommon(digit, five) == 5 {
+				answerDigits[i] = 5
+			} else if len(digit) == 6 && inCommon(digit, six) == 6 {
+				answerDigits[i] = 6
+			} else if len(digit) == 3 && inCommon(digit, seven) == 3 {
+				answerDigits[i] = 7
+			} else if len(digit) == 7 && inCommon(digit, eight) == 7 {
+				answerDigits[i] = 8
+			} else {
+				answerDigits[i] = 9
+			}
+		}
+
+		sum += 1000*answerDigits[0] + 100*answerDigits[1] + 10*answerDigits[2] + answerDigits[3]
+	}
+
+	fmt.Println(sum)
+
+}
+
+func inCommon(a string, b string) (count int) {
+	for _, m := range a {
+		for _, n := range b {
+			if m == n {
+				count++
+			}
+		}
+	}
+
+	return count
+}
+
+func returnContent(path string) *[]string {
+	//read file and return it as an array of integers
+
+	file, err := os.Open(path)
+	var content []string
+
+	if err != nil {
+		fmt.Println("Unlucky, the file didn't open")
+		return &content
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		content = append(content, scanner.Text())
+	}
+
+	return &content
+}

day8/day 8b/testInput

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+16,1,2,0,4,2,7,1,2,14