Restructure project directories

Follow the standard of all go projects

app/utils.go

@@ -1,55 +0,0 @@
-package app
-
-import (
-	"errors"
-	"fmt"
-	"os"
-	"strings"
-
-	"gitlab.com/revalus/grm/config"
-)
-
-func getFileContent(pathToFile string) ([]byte, error) {
-	return os.ReadFile(pathToFile)
-}
-
-func getFileExtension(pathToFile string) (string, error) {
-	splitFileName := strings.Split(pathToFile, ".")
-
-	if len(splitFileName) == 1 {
-		msg := fmt.Sprintf("excension for file \"%v\", not found", splitFileName)
-		return "", errors.New(msg)
-	}
-
-	fileExtension := splitFileName[len(splitFileName)-1]
-
-	return fileExtension, nil
-}
-
-func checkIsItemInSlice(check string, sliceToCheck []string) bool {
-	for _, item := range sliceToCheck {
-		if item == check {
-			return true
-		}
-	}
-
-	return false
-}
-
-func checkAnyOfItemInSlice(check []string, sliceToCheck []string) bool {
-
-	for _, item := range check {
-		if checkIsItemInSlice(item, sliceToCheck) {
-			return true
-		}
-	}
-
-	return false
-}
-
-func reverseRepositoryConfigs(repositories []config.RepositoryConfig) []config.RepositoryConfig {
-	for i, j := 0, len(repositories)-1; i < j; i, j = i+1, j-1 {
-		repositories[i], repositories[j] = repositories[j], repositories[i]
-	}
-	return repositories
-}