cat binairy file in c

binairy_cat.h

#ifndef BINAIRY_CAT_H
#define BINAIRY_CAT_H
#include <stdlib.h>
#include <stdio.h>

bool FileExists(char* pfile)
{
  FILE* fic = fopen(pfile,"r");
  if(fic!=NULL) 
  {
    fclose(fic);
    return true;
  }
  return false;
}
int GetFileLenght(char* pfile)
{
    int size=0;
    FILE* fic = fopen(pfile,"r");
    if(fic!=NULL)
    {
      fseek(fic,SEEK_END,0);
      size = ftell(fic);
      fclose(fic);
    }
    return size;
}
void binairy_cat(char* pfile,char* pfile2,const char* pout)
{
    if(FileExists(pfile) && FileExists(pfile2))
    {
        FILE* fout = fopen(pout,"wb");
        FILE* ffile = fopen(pfile,"rb");
        const int filesize = GetFileLength(pfile);
        char buf1[filesize];
        fread(buf1,filesize,1,ffile);
        fclose(ffile);

        FILE* ffile2 = fopen(pfile2,"rb");
        const int filesize2 = GetFileLength(pfile2);
        char buf2[filesize2];
        fread(buf2,filesize2,1,ffile2);
        fclose(ffile2);

        fwrite(buf1,filesize,1,fout);
        fwrite(buf2,filesize2,1,fout);

        fclose(fout);
    }
}
#endif