buffer not writing to file

suddenly nothing is written to my file

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void taglessLine(char line[],ofstream& buffer){

    buffer.open("buffer.txt", ios::out);

    int len=strlen(line);

    char tagl[chr_len];
    int i=0;

    while(i<len){
        if (line[i]=='<'){
            tagl[i]='\0';
            break;}
         else{
            tagl[i]=line[i];
             i++;

            }
}
    if(buffer.is_open()){
        cout<<"write Succes"<<endl;
        buffer<<tagl<<endl;}
    else
        cout<<"error"<<endl;
    buffer.close();

}/code]

[code]void readFile(char file[], fstream& read){
	char line[chr_len];
	char word;
	ofstream buffer;
    int i=0;
	read.open(file);
	char tagl[chr_len];
	int len=0;

    if(read.fail())
		cout<<"Sorry could not read";

	else{

            read.ignore(200, '\n');
            read.ignore(200, '\n');
            read.ignore(200, '\n');
		while (read.good()){
            read>>word;
            if(word=='<'){
                while(word!='>'){
                    read>>word;

                }}



            read.getline(line,chr_len);
            taglessLine(line, buffer);




}}
        //buffer.close();
    	read.close();

	}
fixed. it every time i was openeing the file it was erasing everything, so I opened it at start in readfile...:)
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    int i=0;

    while(i<len){
        if (line[i]=='<'){
            tagl[i]='\0';
            break;}
         else{
            tagl[i]=line[i];
             i++;

            }
}


I think a for loop would be clearer here. It lets the reader see the structure of the loop separate from what's happening at each iteration:
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for (int i = 0; i < len; ++i) {
        if (line[i]=='<'){
            tagl[i]='\0';
            break;
        } else {
            tagl[i]=line[i];
        }
}


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