BFEE - Morse Code to Location

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

//file delimiter of name and morse code
const string file_delimiter = "     :   ";

//structures
typedef struct
{
    string location;
    string morse;
}MorseInfo;

typedef struct morse_node
{
    MorseInfo *info;
    struct morse_node *next;
}MorseNode;

//functions
//Function to remove all spaces of a string str
string RemoveSpaces(string str)
{
    int pos =0;
    string val = str;
    while((pos = val.find(" ", pos)) != string::npos)
    {
        val.replace(pos, 1, "");
    }
    return val;
}

//Function to remove all slashes "/" from a string str
string RemoveSlashes(string str)
{
    int pos =0;
    string val = str;
    while((pos = val.find("/", pos)) != string::npos)
    {
        val.replace(pos, 1, "");
    }
    return val;
}

void main()
{
    //array of a list of morse codes (a list per stage, 8 stages)
    MorseNode **ListNodes = new MorseNode*[8];
    //initialization
    for(int i=0; i < 8; i++)
    {
        ListNodes[i] = nullptr;
    }

    //open and loading file
    ifstream file;
    file.open("morse.txt");
    string line;
    int pos;
    int stagenum;
    if(file.is_open())
    {
        while(getline(file, line))
        {
            if(line.find("STAGE") != string::npos)
            {
                //-1 because first stage is index 0, 2 is index 1, etc.
                stagenum = stoi(line.substr(6, 1)) - 1;
            }
            else if(line != "")
            {
                pos = line.find(file_delimiter);
                string location = line.substr(0, pos);
                string val = line.substr(pos + file_delimiter.size(), line.size() - 1);

                val = RemoveSpaces(val);
                val = RemoveSlashes(val);

                MorseInfo *info = new MorseInfo;
                info->location = location;
                info->morse = val;

                //always insert in the beginning to make it easier to do
                MorseNode *n = new MorseNode;
                n->info = info;
                n->next = ListNodes[stagenum];
                ListNodes[stagenum] = n;
            }
        }

        file.close();
    }

    //credits
    cout << "BFEE - Morse to Location\n";
    cout << "Credits:\n";
    cout << "Oetjel - Idea and Morse Code list\n";
    cout << "Kimossab - Programmer\n";
    cout << "Rest of Room40 and BFEE discord server\n\n\n";

    int select=0;
    string newmorse;
    cout << "Select a stage:\n(SELECT AN INVALID STAGE TO LEAVE)\nWARNING: DO NOT CLOSE THE PROGRAM OR ALT+F4, PLEASE USE AN INVALID STAGE TO SECURELY CLOSE THE PROGRAM\n";
    cin >> select;
    while(select > 0 && select < 9)
    {
        cout << "\nPlease insert the morse code:\n";
        cin.ignore();
        getline(cin, newmorse, '\n');

        newmorse = RemoveSpaces(newmorse);
        newmorse = RemoveSlashes(newmorse);

        MorseNode *n = ListNodes[select - 1];
        cout << "\n\n";
        while(n)
        {
            if(n->info->morse.find(newmorse) != string::npos)
                cout << n->info->location << " : " << n->info->morse << "\n";
            n = n->next;
        }

        select = 0;
        cout << "Select a stage:\n(SELECT AN INVALID STAGE TO LEAVE)\n";
        cin >> select;
        cin.ignore();
    }


    //memory cleaning
    for(int i=0; i < 8; i++)
    {
        MorseNode *n = ListNodes[i];
        MorseNode *aux = nullptr;
        while(n)
        {
            delete n->info;
            if(aux)
                delete aux;
            aux = n;
            n = n->next;
        }
    }
    delete[] ListNodes;
}