AddressUtils: add stripHost() method

app/src/main/kotlin/d/d/meshenger/AddressUtils.kt

@@ -29,6 +29,7 @@ internal object AddressUtils
     }
 
     // remove interface from link local address
+    // fe80::1%wlan0 => fe80::1
     fun stripInterface(address: String): String {
         val pc = address.indexOf('%')
         return if (pc == -1) {
@@ -38,6 +39,15 @@ internal object AddressUtils
         }
     }
 
+    // strip first entry, e.g.:
+    // /1.2.3.4 => 1.2.3.4
+    // google.com/1.2.3.4 => 1.2.3.4
+    // google.com => google.com
+    fun stripHost(address: String): String {
+        val pos = address.indexOf('/')
+        return address.substring(pos + 1)
+    }
+
     // coarse address type distinction
     enum class AddressType {
         GLOBAL_IP, LOCAL_IP, MULTICAST_IP, DOMAIN
@@ -186,10 +196,10 @@ internal object AddressUtils
                 return null
             }
         } else if (address is Inet6Address) {
-            val str = address.toString().trimStart('/')
+            val str = stripHost(address.toString())
             return "[$str]:$port"
         } else {
-            val str = address.toString().trimStart('/')
+            val str = stripHost(address.toString())
             return "$str:$port"
         }
     }

app/src/main/kotlin/d/d/meshenger/call/RTCUtils.kt

@@ -59,7 +59,7 @@ internal object RTCUtils
         }
 
         // 192.168.1.45, 2a02:8109::7cc5, fe80::1234%wlan0 (WebRTC does not accept link local addresses..)
-        val remoteAddressString = AddressUtils.stripHost(remoteAddress)
+        val remoteAddressString = AddressUtils.stripHost(remoteAddress.toString())
 
         //a=candidate:<foundation> <component> <protocol> <priority> <public-ip-here> <port> typ host
         val iceUdp = "a=candidate:3333333333 1 udp 2222222222 $remoteAddressString ${MainService.serverPort + 1} typ host"