void getHistory (GameView gv, PlayerID player, LocationID trail[TRAIL_SIZE])
{
    //Check if its the beginning of the game
    if (gv->roundNumber == 0) {
        int trailC = 0;
        while(trailC < TRAIL_SIZE){//add UNKNOWN_LOCATION to entire trail
            trail[trailC] = UNKNOWN_LOCATION;
            trailC++;
        }
    } else {
        //find latest play index in pastP
        int lastPlay = latestPlay(gv);
        while(gv->pastP[lastPlay] != player){
            lastPlay = lastPlay - PLAY_LEN;
        }//latest play by player

        //Dracula case:---------------
        if(player == 'D'){
            int count = 0;
            while(count < TRAIL_SIZE){
                char tempLoc[2];
                tempLoc[0] = gv->pastP[lastPlay+1];
                tempLoc[1] = gv->pastP[lastPlay+2];
                tempLoc[2] = '\0';

                int trailAdd;

                if(tempLoc[0]=='C' && tempLoc[1]=='?'){//if unknown city location
                    trailAdd = CITY_UNKNOWN;
                } else if(tempLoc[0]=='S' && tempLoc[1]=='?'){//if unknown sea location
                    trailAdd = SEA_UNKNOWN;
                } else if(tempLoc[0]=='H' && tempLoc[1]=='I'){
                    trailAdd = HIDE;
                } else if(tempLoc[0]=='T' && tempLoc[1]=='P'){
                    trailAdd = TELEPORT;
                }
                else if(tempLoc[0]=='D' && tempLoc[1]=='1'){
                    trailAdd = DOUBLE_BACK_ONE;
                } else if(tempLoc[0]=='D' && tempLoc[1]=='2'){
                    trailAdd = DOUBLE_BACK_TWO;
                } else if(tempLoc[0]=='D' && tempLoc[1]=='3'){
                    trailAdd = DOUBLE_BACK_THREE;
                } else if(tempLoc[0]=='D' && tempLoc[1]=='4'){
                    trailAdd = DOUBLE_BACK_FOUR;
                } else if(tempLoc[0]=='D' && tempLoc[1]=='5'){
                    trailAdd = DOUBLE_BACK_FIVE;
                }

                pushToTrail(trail, trailAdd);//add to trail
                lastPlay = lastPlay - LINE_LEN;
                count++;
            }
        }//-----------------
        else {
        //hunter case:

        //now we fill in the trail, finally.
            int countr = 0;
            while(countr < TRAIL_SIZE){
                char currLoc[2];//current location
                //extract location abbreviation
                currLoc[0] = gv->pastP[lastPlay+1];
                currLoc[1] = gv->pastP[lastPlay+2];
                currLoc[2] = '\0';

                //turn location abbreviation to locationID using places.c
                LocationID currLocation = abbrevToID(currLoc);

                //finally, add locationID to trail
                pushToTrail(trail, currLocation);

                lastPlay = lastPlay - LINE_LEN;//go back to the previous round
                countr++;//will only go to 6 to ensure trail is at most last 6 plays.
            }
            //after all of this the trail array should be updated for
            //whichever player was parsed into the function.
        }
    }
}

//local function to push location onto trail. oldest location falls off trail.
static void pushToTrail(LocationID trail[TRAIL_SIZE], LocationID location){
    assert(trail != NULL);
    int i = 0;
    LocationID temp = trail[i];
    while(trail[i] != '\0'){
        //tests to see if were adding to end of array
        if(i+1 == TRAIL_SIZE){
            trail[i] = location;
            i++;//increments and then loop ends.

        } else {//operation to shift numbers along array.
            trail[i] = location;
            location = temp;
            temp = trail[i+1];
            i++;
        }
    }
}