### Question:
CommandHelper { public static String removeModPrefix(String commandName) { int colonIndex = commandName.indexOf(":"); if (colonIndex != -1) { commandName = commandName.substring(colonIndex + 1); } return commandName; } private  CommandHelper(); static String getRawCommand(String chatMessage); static String removeModPrefix(String commandName);  }### Answer:
@Test public void testRemoveModPrefix() { assertThat(CommandHelper.removeModPrefix("help"), is("help")); assertThat(CommandHelper.removeModPrefix("minecraft:help"), is("help")); assertThat(CommandHelper.removeModPrefix("bukkit:help"), is("help")); assertThat(CommandHelper.removeModPrefix("hey look i have spaces:help"), is("help")); }