+int store_str_variable_value_to_array(const char *variable, const char *value,
+ struct plotter_config *cfg);
+int store_int_variable_value_to_array(const char *variable, int value,
+ struct plotter_config *cfg);
+int replace_variables_with_values(char *str, size_t len,
+ const struct plotter_config *cfg);
+