fix: silence golangci-lint

internal/2018/DayTwo/code_test.go

@@ -45,11 +45,11 @@ func TestPartTwo(t *testing.T) {
 
 	PartTwo(input)
 
-	w.Close()
+	_ = w.Close()
 	os.Stdout = oldStdout
 
 	var buffer bytes.Buffer
-	buffer.ReadFrom(r)
+	_, _ = buffer.ReadFrom(r)
 	got := strings.TrimSpace(buffer.String())
 
 	if got != expected {

internal/2020/DayFour/code.go

@@ -91,7 +91,7 @@ func PartTwo(data []string) int {
 			return false
 		}
 		for _, c := range value[1:] {
-			if !((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f')) {
+			if (c < '0' || c > '9') && (c < 'a' || c > 'f') {
 				return false
 			}
 		}

internal/2020/DayTwo/code.go

@@ -14,11 +14,8 @@ func init() {
 func ParseInput(filepath string) []string {
 	content, _ := os.ReadFile(filepath)
 	lines := strings.Split(string(content), "\n")
-	var data []string
-	for _, line := range lines {
-		data = append(data, line)
-	}
-	return data
+	data := make([]string, 0, len(lines))
+	return append(data, lines...)
 }
 
 func PartOne(data []string) int {