Methods return values that are never used
When a user calls `investDAI` these 3 methods are called internally:\\n```\\n\\_updateTopUsers();\\n\\_updateLeaderboard(\\_userTeamInfo.teamAddr);\\n\\_updateGroupLeaders(\\_userTeamInfo.teamAddr);\\n```\\n\\nEach method returns a boolean, but the value is never used. It is also unclear what the value should represent.
Remove the returned variable or use it in method `investDAI`.
```\\n\\_updateTopUsers();\\n\\_updateLeaderboard(\\_userTeamInfo.teamAddr);\\n\\_updateGroupLeaders(\\_userTeamInfo.teamAddr);\\n```\\n