Function lyd_any_value_str 

pub unsafe extern "C" fn lyd_any_value_str(
    any: *const lyd_node,
    format: Type,
    value_str: *mut *mut c_char,
) -> Type

@brief Get anydata string value.

@param[in] any Anyxml/anydata node to read from. @param[in] format Format to use in case the value is a data tree. @param[out] value_str String representation of the value. @return LY_ERR value.