Hello, I'm making a program in C, and I'mm having some troubles with memory, I think.

So my problem is: I have 2 functions that return a struct. When I run only one function at a time I have no problem whatsoever. But when I run one after the other I always get an error when writting to the second struct.

Function struct item* ReadFileBIN(char *name) -- reads a binary file. struct tables* getMesasInfo(char* Filename) -- reads a text file.

My code is this:

#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

int numberOfTables=0;
int numberOfItems=0;

//struct tables* mesas;
//struct item* Menu;

typedef struct item{
    char nome[100];
    int id;
    float preco;
};
typedef struct tables{
    int id;
    int capacity;
    bool inUse;
};
struct tables* getMesasInfo(char* Filename){
    struct tables* mesas;
    char *c;
    int counter,numberOflines=0,temp=0;
    char *filename=Filename;
    FILE * G;
    G = fopen(filename,"r");
    if (G==NULL){
        printf("Cannot open file.\n");
    }
    else{
     while (!feof(G)){
     fscanf(G, "%s", &c);
     numberOflines++;
        }
    fclose(G);
    }  
    /* Memory allocate for input array */
    mesas = (struct tables *)malloc(numberOflines* sizeof(struct tables*));
    counter=0;
    G=fopen(filename,"r");
    while (!feof(G)){
        mesas[counter].id=counter;
        fscanf(G, "%d", &mesas[counter].capacity);
        mesas[counter].inUse= false;
        counter++;
    }
fclose(G);
numberOfTables = counter;
return mesas;
}

struct item* ReadFileBIN(char *name)
{
        int total=0;
        int counter;
        FILE *ptr_myfile;
        struct item my_record;
        struct item* Menu;
        ptr_myfile=fopen(name,"r");
        if (!ptr_myfile)
        {
            printf("Unable to open file!");
        }

        while (!feof(ptr_myfile)){
            fread(&my_record,sizeof(struct item),1,ptr_myfile);
            total=total+1;
        }
        numberOfItems=total-1;
        Menu = (struct item *)calloc(numberOfItems , sizeof(struct item));
        fseek(ptr_myfile, sizeof(struct item), SEEK_END);
        rewind(ptr_myfile);
        for ( counter=1; counter < total ; counter++)
        {
            fread(&my_record,sizeof(struct item),1,ptr_myfile);
            Menu[counter] = my_record;
            printf("Nome: %s\n",Menu[counter].nome);
            printf("ID: %d\n",Menu[counter].id);
            printf("Preco: %f\n",Menu[counter].preco);
        }
        fclose(ptr_myfile);
        return Menu;
}

int _tmain(int argc, _TCHAR* argv[])
{
    struct item* tt = ReadFileBIN("menu.dat");
    struct tables* t = getMesasInfo("Capacity.txt");
    getchar();
}**

Thanks in advance.