pub unsafe extern "C" fn switch_event_build_param_string(
event: *mut switch_event_t,
prefix: *const c_char,
vars_map: *mut switch_hash_t,
) -> *mut c_charpub unsafe extern "C" fn switch_event_build_param_string(
event: *mut switch_event_t,
prefix: *const c_char,
vars_map: *mut switch_hash_t,
) -> *mut c_char