Blank spaces when using fstream to write a - c++

Question

Using fstream to write a string in a file is putting a blank space between every letter, the string i am writing comes from a function that converts binary code into a ascii:
void almacenar(string texto)
{
string temp;
string test = "hola";
string compreso ="";
remove("compreso.daar");
int textosize=texto.size();
int i = 0;
while (i<textosize){
while(temp.size()!=8){
temp=temp+texto[i];
i++;
if (i>=textosize) {
break;
}
}
compreso=compreso+bitoascii(temp);
temp.clear();
}
Escribir(test,"compreso.daar");
}
int Escribir(string i,const char* archivo)
{
fstream outputFile;
outputFile.open(archivo, fstream::app);
outputFile<<i;
outputFile.close();
return 0;
}
string bitoascii(std::string data)
{
std::stringstream sstream(data);
std::string output;
while(sstream.good())
{
std::bitset<8> bits;
sstream >> bits;
char c = char(bits.to_ulong());
output += c;
}
return output;
}
The file sould have "Ø" have "Ø " or "ØØ" is "Ø Ø" if i print via console the string that contains Ø it has no spaces

Answer 1

In the function bitoascii(), after transferring data from sstream to bits you are not checking if the transfer succeeded and instead of having converted data, the value of bits is 0x00 and the value is recorded in the file, but the character '\0' is not printable.
Just add a sstream.good() to know if bits has been correctly
written before adding the characters in the output string.
The function bitascii() should be:
string bitoascii(std::string data)
{
std::stringstream sstream(data);
std::string output;
while(sstream.good())
{
std::bitset<8> bits;
sstream >> bits;
// check is the transfer failed then exit from while
if (!sstream.good()) break;
char c = char(bits.to_ulong());
output += c;
}
return output;
}