feature: added GetFirstIndexedNonExistingFilePath to files

pkg/io/files/file_exists_checker.go

@@ -2,7 +2,9 @@ package files
 
 import (
 	"errors"
+	"fmt"
 	"os"
+	"path/filepath"
 )
 
 func IsFileExists(fileLocation string) bool {
@@ -12,3 +14,19 @@ func IsFileExists(fileLocation string) bool {
 
 	return true
 }
+
+func GetFirstIndexedNonExistingFilePath(parentDir string, fileBaseName string) string {
+	filePath := filepath.Join(parentDir, fileBaseName)
+	index := 0
+	for {
+		if !IsFileExists(filePath) {
+			break
+		}
+
+		index++
+
+		filePath = filepath.Join(parentDir, fmt.Sprintf("%s-%d", fileBaseName, index))
+	}
+
+	return filePath
+}