🎉 🚧 Start working on backend

backend/utils/utils.go

@@ -0,0 +1,38 @@
+package utils
+
+import (
+	"os"
+
+	"golang.org/x/exp/rand"
+)
+
+func Getenv(key string, fallback string) string {
+	value, exists := os.LookupEnv(key)
+	if exists {
+		return value
+	} else {
+		return fallback
+	}
+}
+
+func RemoveSliceElement[T comparable](slice *([]T), target T) bool {
+	for i, el := range *slice {
+		if el == target {
+			*slice = append((*slice)[:i], (*slice)[i+1:]...)
+			return true
+		}
+	}
+	return false
+}
+
+func ShuffleSlice[T any](slice *([]T)) {
+	length := len(*slice)
+	for i := 0; i < length; i++ {
+		j := rand.Intn(i + 1)
+		(*slice)[i], (*slice)[j] = (*slice)[j], (*slice)[i]
+	}
+}
+
+func Mod(a, b int) int {
+	return (a%b + b) % b
+}