lock to ensure email finishes call

main.go

@@ -11,25 +11,28 @@ import (
 	"log"
 	"regexp"
 	"strings"
+	"sync"
 	"time"
 )
 
 var stateFinder = regexp.MustCompile(`[ ^>][A-Z][A-Z][ $<]`)
 
 func main() {
+	lock := &sync.Mutex{}
 	go func() {
-		email()
 		c := time.NewTicker(time.Minute)
 		for range c.C {
+			lock.Lock()
 			if err := email(); err != nil {
 				log.Print(err)
 			}
+			lock.Unlock()
 		}
 	}()
 	if err := _main(); err != nil {
 		panic(err)
 	}
-	time.Sleep(time.Minute)
+	lock.Lock()
 }
 
 func email() error {