1. Allocate memory for the ue_id and ue_info_list arrays on the stack.
Explanation:
   Every granularity period, the program passes through the fp_match_cond_type,
   then through match_s_nssai_test_cond_type function pointers. Based on the node type,
   the function used calloc() for these arrays.
   => the longer a connection with an E2SM-KPM xApp was, the more memory leakage occured.
2. If matched UEs > 0, only free the memory of ue_id content after each
   Indication Message was sent.