diff --git a/100_errors_go/interfaces/main.go b/100_errors_go/interfaces/main.go
new file mode 100644
index 0000000..d3ca4f3
--- /dev/null
+++ b/100_errors_go/interfaces/main.go
@@ -0,0 +1,72 @@
+package main
+
+BAD
+// Producer
+
+type CustomerStorage interface {
+	StoreCustomer(customer string) error
+	GetCustomer(is string) error
+	UpdateCustomer(customer string) error
+	GetAllCustomers() ([]string,error)
+	GetCustomerWithoutContract() ([]string,error)
+} 
+
+//======================================
+
+
+// Consumer
+
+type customerGetter interface {
+	GetAllCustomers() ([]string,error)
+}
+
+
+
+//===================================================================
+
+type IntConfig struct {
+	// ...
+}
+
+func (c IntConfig) Get() int {        <======== PRODUCER
+	return 0
+}
+
+func (c IntConfig) Set(value int) {
+	//...
+}
+
+
+
+Consumer
+
+type confifSetter interface{
+	Set()
+}
+
+type configGetter interface {
+	Get() int
+}
+
+type Mixed interface {
+	confifSetter
+	configGetter
+}
+
+
+
+
+
+
+
+type Foo struct {
+	threshold configGetter
+}
+
+func NewFoo(new_threshold configGetter) Foo {
+	return Foo{threshold: new_threshold}
+}
+
+func (f Foo) Bar() {
+	threshold := f.threshold.Get()
+}
diff --git a/goroutines/go.mod b/goroutines/go.mod
new file mode 100644
index 0000000..454ddb6
--- /dev/null
+++ b/goroutines/go.mod
@@ -0,0 +1,3 @@
+module main
+
+go 1.25.6
diff --git a/goroutines/main.go b/goroutines/main.go
new file mode 100644
index 0000000..ed9d8d5
--- /dev/null
+++ b/goroutines/main.go
@@ -0,0 +1,19 @@
+package main
+
+import "fmt"
+
+func Route(i int, ch chan<- int) {
+	ch <- i
+}
+
+func main() {
+	ch := make(chan int)
+
+	for i:= range 10 {
+		go Route(i, ch)
+	}	
+
+	for i := range ch {
+		fmt.Println(i)
+	}
+}
diff --git a/rbd_exporter/main.go b/rbd_exporter/main.go
index b2456b9..e1332ff 100644
--- a/rbd_exporter/main.go
+++ b/rbd_exporter/main.go
@@ -78,6 +78,7 @@ func main() {
 
 	// HTTP runs in separate thread cuz it blocks further execution of main
 	go func() {
+		fmt.Fprint()
 		mainlogger.Info("Starting http server")
 		// Here I check for errors if HTTP fails
 		if err := server.ListenAndServe(); err != nil {