init project

internal/utils/currency.go

@@ -0,0 +1,43 @@
+package utils
+
+import (
+	"fmt"
+	"math/rand"
+	"strconv"
+	"strings"
+	"time"
+)
+
+func FormatCurrency(value float64) string {
+	currencyStr := strconv.FormatFloat(value, 'f', 2, 64)
+	split := strings.Split(currencyStr, ".")
+	n := len(split[0])
+	if n <= 3 {
+		return fmt.Sprintf("Rp %s,%s", split[0], split[1])
+	}
+	var result []string
+	for i := 0; i < n; i += 3 {
+		end := n - i
+		start := end - 3
+		if start < 0 {
+			start = 0
+		}
+		result = append([]string{split[0][start:end]}, result...)
+	}
+	currencyStr = strings.Join(result, ".")
+	return fmt.Sprintf("Rp %s,%s", currencyStr, split[1])
+}
+
+const charset = "abcdefghijklmnopqrstuvwxyz" +
+	"ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+
+var seededRand *rand.Rand = rand.New(
+	rand.NewSource(time.Now().UnixNano()))
+
+func GenerateRandomString(length int) string {
+	b := make([]byte, length)
+	for i := range b {
+		b[i] = charset[seededRand.Intn(len(charset))]
+	}
+	return string(b)
+}