Turn char to float with overrided stof function

turn_char_to_float.cpp

void SerialDriver::draw(const core::visual::VisualParams* vparam)
{
    vparam = NULL;
    draw();
}

float stof(const char* s){
    float rez = 0, fact = 1;
    if (*s == '-'){
        s++;
        fact = -1;
    }
    for (int point_seen = 0; *s; s++){
        if (*s == '.'){
            point_seen = 1; 
            continue;
        }
    
    int d = *s - '0';
    
    if (d >= 0 && d <= 9){
        if (point_seen) fact /= 10.0f;
            rez = rez * 10.0f + (float)d;
        }
    }

    return rez * fact;
}