feat: add generate_otp util

server/utils/generate_otp.go

@@ -0,0 +1,24 @@
+package utils
+
+import (
+	"math/rand"
+	"time"
+)
+
+func GenerateOTP() string {
+	code := ""
+	codeLength := 6
+	charSet := "ABCDEFGHJKLMNPQRSTUVWXYZ123456789"
+	charSetLength := int32(len(charSet))
+	for i := 0; i < codeLength; i++ {
+		index := randomNumber(0, charSetLength)
+		code += string(charSet[index])
+	}
+
+	return code
+}
+
+func randomNumber(min, max int32) int32 {
+	rand.Seed(time.Now().UnixNano())
+	return min + int32(rand.Intn(int(max-min)))
+}