update: remove redundant functions

include/common/sundry.h

@@ -4,13 +4,11 @@
 #include <stdint.h>
 
 char* show_bool(uint8_t value);
+uint8_t check_port(uint16_t port);
 char* string_load(const char *fmt, ...);
 char* uint32_to_string(uint32_t number);
 char* string_join(const char *base, const char *add);
 void string_list_debug(char *describe, char **string_list);
 void uint32_list_debug(char *describe, uint32_t **uint32_list);
 
-uint8_t check_port(uint16_t port);
-uint16_t gen_rand_num(uint16_t limit);
-
 #endif

include/common/system.h

@@ -4,7 +4,6 @@
 #include <stdint.h>
 
 char* read_file(const char *file);
-void remove_file(const char *file);
 int run_command(const char *command);
 void create_folder(const char *folder);
 uint8_t is_file_exist(const char *file);

src/common/sundry.c

@@ -56,11 +56,3 @@ uint8_t check_port(uint16_t port) { // whether port is valid
     }
     return FALSE;
 }
-
-uint16_t gen_rand_num(uint16_t limit) { // 0 ~ (limit - 1)
-    struct timeval tv;
-    gettimeofday(&tv, NULL);
-    srand(tv.tv_usec);
-    usleep(1); // sleep 1us (different time seed)
-    return rand() % limit; // NOLINT
-}

src/common/system.c

@@ -17,16 +17,6 @@ int run_command(const char *command) { // running command under system shell
     return ret_code;
 }
 
-void remove_file(const char *file) { // delete file
-    if (!is_file_exist(file)) { // file not found
-        log_debug("Delete file `%s` skip -> file not exist", file);
-    } else if (remove(file)) { // remove failed
-        log_perror("Delete file `%s` failed -> ", file);
-    } else { // remove success
-        log_debug("Delete file `%s` success", file);
-    }
-}
-
 void create_folder(const char *folder) { // create folder
     if (!access(folder, 0)) { // target is file or folder
         struct stat buf;