Prevent players from taking reserved names. Make the duplicate player name check case insensitive.
Prevent players from taking reserved names.
Make the duplicate player name check case insensitive.

iosoccer/iosoccer-game,ziming/IOS,ziming/IOS,ziming/IOS,romdi/IOS,romdi/IOS,romdi/IOS,iosoccer/iosoccer-game,iosoccer/iosoccer-game,ziming/IOS,iosoccer/iosoccer-game,romdi/IOS