// usage
{
    char* str = "athano azen";
    char entity_a[128];
    char entity_b[128];
    char* curr = str;
    curr = parse_identifier(curr, entity_a);
    if(!curr) {
        // DIDNT FIND AN IDENTIFIER AKA ENTITY NAME IN THIS CASE
        return;
    }
    curr = parse_identifier(curr, entity_b);
    if(!curr) {
        // FOUND ONE NAME BUT NOT TWO
        return;
    }
    // entity_a is "athano"
    // entity_b is "azen"
}

char* parse_identifier(char* source, char* fill_me_up_big_boy)
{
    // skip spaces
    while(*source == ' ') {
        source += 1;
    }

    char* result = null;
    if(!begins_identifier(source[0])) { return result; }
    int i = 1;
    while(true) {
        if(!continues_identifier(source[i])) {
            memcpy(fill_me_up_big_boy, source, i);
            fill_me_up_big_boy[i] = 0;
            result = &source[i];
            break;
        }
        i += 1;
    }
    return result;
}




/////////
bool is_number(char c)
{
    return c >= '0' && c <= '9';
}

bool is_alpha(char c)
{
    return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ;
}

bool is_alphanum(char c)
{
    return is_alpha(c) || is_number(c);
}

bool begins_identifier(char c)
{
    return is_alphanum(c) || c == '_'
}

bool continues_identifier(char c)
{
    return begins_identifier(c) || is_number(c);
}