function passed using references

pkg/controllers/gacha-controller.go

@@ -143,13 +143,13 @@ func HandleGachaDraw(w http.ResponseWriter, r *http.Request) {
 		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
 		return
 	}
-	characterPool := generateCharacterPool(characters)
+	characterPool := GenerateCharacterPool(characters)
 	response := models.GachaDrawResponse{
 		Results: make([]models.CharacterResponse, reqBody.Times),
 	}
 
 	for i := 0; i < reqBody.Times; i++ {
-		character, err := drawCharacter(characterPool)
+		character, err := DrawCharacter(&characterPool)
 		if err != nil {
 			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
 			return
@@ -174,8 +174,8 @@ func HandleGachaDraw(w http.ResponseWriter, r *http.Request) {
 	w.Write(respBody)
 }
 
-func generateCharacterPool(characters []models.Character) []models.Character {
-	characterPool := make([]models.Character, 0)
+func GenerateCharacterPool(characters []models.Character) []*models.Character {
+	characterPool := make([]*models.Character, 0)
 	probabilityMap := make(map[uint]int)
 
 	for _, character := range characters {
@@ -195,7 +195,7 @@ func generateCharacterPool(characters []models.Character) []models.Character {
 	}
 
 	for characterID, probability := range probabilityMap {
-		character := findCharacterByID(characters, characterID)
+		character := FindCharacterByID(characters, characterID)
 		for i := 0; i < probability; i++ {
 			characterPool = append(characterPool, character)
 		}
@@ -204,31 +204,31 @@ func generateCharacterPool(characters []models.Character) []models.Character {
 	return characterPool
 }
 
-func findCharacterByID(characters []models.Character, characterID uint) models.Character {
+func FindCharacterByID(characters []models.Character, characterID uint) *models.Character {
 	for _, character := range characters {
 		if character.ID == characterID {
-			return character
+			return &character
 		}
 	}
-	return models.Character{}
+	return nil
 }
 
-func drawCharacter(characterPool []models.Character) (models.Character, error) {
-	poolSize := len(characterPool)
+func DrawCharacter(characterPool *[]*models.Character) (*models.Character, error) {
+	poolSize := len(*characterPool)
 	if poolSize == 0 {
-		return models.Character{}, errors.New("empty character pool")
+		return nil, errors.New("empty character pool")
 	}
 
 	// Randomly select a character from the pool
 	randIndex, err := rand.Int(rand.Reader, big.NewInt(int64(poolSize)))
 	if err != nil {
-		return models.Character{}, errors.New("failed to generate random number")
+		return nil, errors.New("failed to generate random number")
 	}
 	index := int(randIndex.Int64())
-	character := characterPool[index]
+	character := (*characterPool)[index]
 
 	// Remove the selected character from the pool
-	characterPool = append(characterPool[:index], characterPool[index+1:]...)
+	*characterPool = append((*characterPool)[:index], (*characterPool)[index+1:]...)
 
 	return character, nil
 }