stock GetClosestPlayer(playerid)
{
    new Float:cdist, targetid = -1;
    for (new i = 0; i < MAX_PLAYERS; i++)
    {
        if (IsPlayerConnected(i) && GetPlayerState(i) != PLAYER_STATE_SPECTATING && playerid != i && (targetid < 0 || cdist > GetDistanceBetweenPlayers(playerid, i)))
        {
            targetid = i;
            cdist = GetDistanceBetweenPlayers(playerid, i);
        }
    }
    return targetid;
}

//
new Tplayer = GetClosestPlayer(playerid);// use this in command

//

GetPlayerPos(playerid,x,y,z);
       if(IsPlayerInRangeOfPoint(Tplayer,6.0,x,y,z)){
       SendClientMessage(Tplayer, COLOR_RED,"You have been raped!"); //send message to Tplayer(target)
       SendClientMessage(playerid, COLOR_RED,"You have raped target player"); // send message to playerid (user)
       
       // code
       }else{
       SendClientMessage(playerid, COLOR_RED,"No one is close enough.");// similarly
       }