Assistance needed --Plz

This program is suppose to do 3 things:

1 - copy a string using: strncpy (without Null) and strncpy (with null)
2- Input a string and reverse it (i.e. enter First Name Last and output Last, First)
3- Use a substring to that will read a portion of a string

The following is the code I have, but it just doesn't want to work and I can't figure out why.
Any help would be greatly appreciated.

Thank you

Code:

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#include<iostream>

using std::cout;
using std::cin;
using std::endl;
using std::flush;


#include <cstring>
using std::string;

void mystrncpy (char *, char *, int);
void LastNameFirst (char *, char *);
void substr (char *, char*, int, int);

const int MAX_STRING = 200;
int main()
{
        char Source[MAX_STRING];
        char Destination[MAX_STRING];
        int MaxLength;
        char Name[MAX_STRING];
        char NewName[MAX_STRING];
        int StartIndex;
        int SubMaxLength;
       
        cout <<"Enter string to be copied: ";
        cin.getline(Source, MAX_STRING, '\n');
        cout <<"Enter number of characters to be copied: ";
        cin>>MaxLength;
        cout<<"\nThe string you entered is: ";
        cout<<Source;
        mystrncpy (Destination, Source, MaxLength);
        cout<<endl;
       

        cout<<"\nEnter name (in the form First name, Space, Last Name): ";
        cin.getline(Name, MAX_STRING, '\n');
        for (int i=0; i<3; i++){
        LastNameFirst (Name, NewName);
        cout<<"Name after conversion is: "<<NewName<<endl;
       
        }
       

        cout<<"\nEnter a string: ";
        cin.getline(Source, MAX_STRING, '\n');
        cout<<"Enter a starting index number: ";
        cin>>StartIndex;
        cout<<"Enter a length to copy: ";
        cin>>SubMaxLength;
        cout<<"\nThe string you entered was: "<<Source;
        cout<<"\nThe converted string is: ";
        substr (Destination, Source, StartIndex, SubMaxLength);


        return 0;
}


void mystrncpy (char *Destination, char *Source, int MaxLength)
{
       
        strncpy(Destination, Source, MaxLength);
        cout<<"\nThe string you entered using strncpy is: "<<Destination[MaxLength];
        strncpy(Destination, Source, MaxLength-1);
        Destination[(MaxLength - 1)] = '\0';
        cout<<"\nThe string you entered using mystrncpy is: "<<Destination<<endl;
       
}


void LastNameFirst (char *Name, char *NewName)
{
        char *p;
        p = strchr(Name, ' ');
        *p = 0;

        //copy last name to NewName, append ", " and
        //concatenate first name

        strcpy(NewName, p+1);
        strcat(NewName, ", ");
        strcat(NewName, Name);
       
        //replace the NULL char with the original blank
        *p = ' ' ;

}

void substr(char *Destination, char *Source, int StartIndex, int SubMaxLength)
{
       
        string (Destination, StartIndex, SubMaxLength);
        cout<<Destination[StartIndex, SubMaxLength+1]<<endl;
}

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Try this (old code commented).

Code:

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int main()
{
        char Source[MAX_STRING];
        char Destination[MAX_STRING];
        int MaxLength;
        char Name[MAX_STRING];
        char NewName[MAX_STRING];
        int StartIndex;
        int SubMaxLength;
       
        cout <<"Enter string to be copied: ";
        cin.getline(Source, MAX_STRING, '\n');
        cout <<"Enter number of characters to be copied: ";
        cin>>MaxLength;
        cin.ignore();
        cout<<"\nThe string you entered is: ";
        cout<<Source;
        mystrncpy (Destination, Source, MaxLength);
        cout<<endl;
       

        cout<<"\nEnter name (in the form First name, Space, Last Name): ";
        cin.getline(Name, MAX_STRING, '\n');
        for (int i=0; i<3; i++){
          LastNameFirst (Name, NewName);
          cout<<"Name after conversion is: "<<NewName<<endl;
       
        }

        cout<<"\nEnter a string: ";
        cin.getline(Source, MAX_STRING, '\n');
        cout<<"Enter a starting index number: ";
        cin>>StartIndex;
        cout<<"Enter a length to copy: ";
        cin>>SubMaxLength;
        cout<<"\nThe string you entered was: "<<Source;
        cout<<"\nThe converted string is: ";
        substr (Destination, Source, StartIndex, SubMaxLength);


        return 0;
}


void mystrncpy (char *Destination, char *Source, int MaxLength)
{
       
        strncpy(Destination, Source, MaxLength);
        //cout<<"\nThe string you entered using strncpy is: "<<Destination[MaxLength];
        cout<<"\nThe string you entered using strncpy is: "<<Destination << endl;
        strncpy(Destination, Source, MaxLength);
        //Destination[(MaxLength - 1)] = '\0';
        Destination[MaxLength] = '\0';
        cout<<"\nThe string you entered using mystrncpy is: "<<Destination<<endl;
       
}

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I wish somebody would do my CS homework! :(

axon