read an action line of a makefile and turn it into a struct action_node
typedef struct action_node {
    char **args;  // An array of strings suitable to be passed to execvp
    struct action_node *next_act;
} Action;        
        
        if(is_action(fp_line) == 1){
            char **act_args = malloc(sizeof(char **));
            char *action_token = strtok(fp_line, " \t");
            action_token = strtok(NULL, " \t");
            while(action_token != NULL){
                continue;
                action_token = strtok(NULL, " \t");
            }
            Action *a = create_action_node(act_args);
            add_action_node(current_rule, a);
        }