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#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
 
int main()
{ 
    FILE *F1 = fopen("11.exe", "rb" );
    FILE *F2 = fopen("22.exe", "wb" );
 
    fseek(F1, 0, SEEK_END);
    int file_size = ftell(F1);
    rewind(F1);
 
    char *buffer = (char*)malloc(file_size);
 
    if(fread(buffer, 1, file_size, F1) != file_size)
    {
        printf("Couldn't read!");
    }
 
    if(fwrite(buffer, 1, file_size, F2) != file_size)
    {
        printf("Couldn't write!");
    }
 
    printf("Success!");
    fclose(F1);
    fclose(F2);
    getch();
}

#include <stdio.h>
#include <conio.h>
#include <string.h>
#include <stdlib.h>
 
void ReadFile(char *source, char *buffer)
{   
    FILE *F = fopen(source, "rb");
    fseek(F, 0, SEEK_END);
    int file_size = ftell(F);
    rewind(F);
 
    char *str = (char*)malloc(file_size);
 
    if(fread(str, 1, file_size, F) != file_size)
    {
        printf("Couldn't read!");
    }
     strcpy(buffer, str);
     fclose(F);
}
 
void WriteFile(char *dest, int size, char *buffer)
{
    FILE *F = fopen(dest, "wb");
 
    if(fwrite(buffer, 1, size, F) != size)
    {
        printf("Couldn't write!" );
    }
    fclose(F);
}
 
int main()
{ 
    FILE *F = fopen("33.jpg", "rb"); 
    fseek(F, 0, SEEK_END);
    int file_size = ftell(F);
    rewind(F);
    fclose(F);
 
    char *buffer = (char*)malloc(file_size);
 
    ReadFile("33.jpg", buffer);
    WriteFile("22.jpg", file_size, buffer);
 
    printf("\nSuccess!");
    getch();
}