Б[0]=A[0];
Б[0]+=A[0+1];
Б[0]+=A[0+2];

QByteArray m = ui->lineEdit->text().toLatin1().data();

unsigned char ch[9];

for(int i =0; i<12; ++i)
{
     if(m[i]==' ')
          m[i]=m[i+1];
ch[i]=m[i];
ch[i]+=m[i+1];
ch[i]+=m[i+2];

}

QRegExp val(" ");
QString newStr = str.replace(val, QString(""));

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char const *argv[]) {
    const char * a = "001 010 010 000";
    char *       b = calloc(1, sizeof(char));

    int j = 1;

    for (int i = 0; i < strlen(a); i++) {
        if (a[i] != ' ') {
            b = realloc(b, j*sizeof(char));
            b[j-1] = a[i];
            j++;
        }
    }

    b[j-2] = '';

    printf("%sn%sn", a, b);

    return 0;
}