make helper function for trimming a twitch channel name from irc

src/providers/twitch/twitchhelpers.cpp

@@ -0,0 +1,22 @@
+#include "providers/twitch/twitchhelpers.hpp"
+#include "debug/log.hpp"
+
+namespace chatterino {
+namespace providers {
+namespace twitch {
+
+bool TrimChannelName(const QString &channelName, QString &outChannelName)
+{
+    if (channelName.length() < 3) {
+        debug::Log("channel name length below 2");
+        return false;
+    }
+
+    outChannelName = channelName.mid(1);
+
+    return true;
+}
+
+}  // namespace twitch
+}  // namespace providers
+}  // namespace chatterino