refactor: extract read all text method to file package

cmd/02/main.go

@@ -1,9 +1,10 @@
 package main
 
 import (
-	"os"
 	"strconv"
 	"strings"
+
+	"github.com/StevanFreeborn/advent-of-code-2025/internal/file"
 )
 
 const SeparatorCharacter = ","
@@ -15,13 +16,8 @@ type Range struct {
 }
 
 func SolvePartOne(filePath string) int64 {
-	bytes, readErr := os.ReadFile(filePath)
-
-	if readErr != nil {
-		return 0
-	}
-
-	strRanges := strings.SplitSeq(string(bytes), SeparatorCharacter)
+	input := file.ReadAllText(filePath)
+	strRanges := strings.SplitSeq(input, SeparatorCharacter)
 
 	rngs := []Range{}
 

internal/file/file.go

@@ -24,3 +24,13 @@ func ReadLines(filePath string) []string {
 
 	return lines
 }
+
+func ReadAllText(filePath string) string {
+	fileContent, readErr := os.ReadFile(filePath)
+
+	if readErr != nil {
+		return ""
+	}
+
+	return string(fileContent)
+}

internal/file/file_test.go

@@ -19,3 +19,13 @@ func TestReadLines(t *testing.T) {
 		t.Errorf("got %s but expected %s", result, expectedLines)
 	}
 }
+
+func TestReadAllText(t *testing.T) {
+	expectedText := "hello\r\nworld\r\n"
+
+	result := file.ReadAllText("test.txt")
+
+	if result != expectedText {
+		t.Errorf("got %q but expected %q", result, expectedText)
+	}
+}