refactor: split utils into smaller files

internal/utils/fs_utils.go

@@ -0,0 +1,17 @@
+package utils
+
+import "os"
+
+func ReadFile(file string) (string, error) {
+	_, err := os.Stat(file)
+	if err != nil {
+		return "", err
+	}
+
+	data, err := os.ReadFile(file)
+	if err != nil {
+		return "", err
+	}
+
+	return string(data), nil
+}