Better Way of Caching

Instead of Caching by maintaining a cache file as mentioned here https://github.com/aditya-K2/goMP/issues/14#issuecomment-989141798
We can directly check if the file exists if it exists then we can just
pass the path to it else we can copy the default image to the path of
the imagePath

cache/cache.go

@@ -3,70 +3,30 @@ package cache
 import (
 	"errors"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strings"
 )
 
 var (
-	USER_CACHE_DIR, err                      = os.UserCacheDir()
-	CACHE_LIST          map[[2]string]string = make(map[[2]string]string)
-	CACHE_DIR           string               = USER_CACHE_DIR
-	DEFAULT_IMG         string
+	CACHE_DIR   string
+	DEFAULT_IMG string
 )
 
 func SetCacheDir(path string) {
 	CACHE_DIR = path
 }
 
-func SetDefaultPath(path string) {
-	DEFAULT_IMG = path
-}
-
-func LoadCache(path string) error {
-	cacheFileContent, err := ioutil.ReadFile(path)
-	if err != nil {
-		return errors.New("Could Not Read From Cache File")
-	}
-	lineSlice := strings.Split(string(cacheFileContent), "\n")
-	for _, line := range lineSlice {
-		if len(line) != 0 {
-			param := strings.Split(line, "\t")
-			if len(param) == 3 {
-				CACHE_LIST[[2]string{param[0], param[1]}] = param[2]
-			}
-		}
-	}
-	return nil
-}
-
-func GetFromCache(artist, album string) (string, error) {
-	if val, ok := CACHE_LIST[[2]string{artist, album}]; ok {
-		return val, nil
+func Exists(artist, album string) bool {
+	if _, err := os.Stat(GenerateName(artist, album)); errors.Is(err, os.ErrNotExist) {
+		return false
 	} else {
-		return "", errors.New("Element Not In Cache")
-	}
-}
-
-func PointToDefault(artist, album string) {
-	CACHE_LIST[[2]string{artist, album}] = DEFAULT_IMG
-}
-
-func AddToCache(artist, album string) string {
-	fileName := CACHE_DIR + GenerateName(artist, album)
-	CACHE_LIST[[2]string{artist, album}] = fileName
-	return fileName
-}
-
-func WriteCache(path string) {
-	b, err := os.Create(path)
-	if err == nil {
-		for k, v := range CACHE_LIST {
-			b.Write([]byte(fmt.Sprintf("%s\t%s\t%s\n", k[0], k[1], v)))
-		}
+		return true
 	}
 }
 
 func GenerateName(artist, album string) string {
-	return strings.Replace(strings.Replace(fmt.Sprintf("%s-%s.jpg", artist, album), " ", "_", -1), "/", "_", -1)
+	if (artist == "" && album == "") || (artist == " " && album == " ") {
+		return CACHE_DIR + "UnknownArtist-UnknownAlbum.jpg"
+	}
+	return CACHE_DIR + strings.Replace(strings.Replace(fmt.Sprintf("%s-%s.jpg", artist, album), " ", "_", -1), "/", "_", -1)
 }