lab5: 指令参数匹配可能缺少空格

lab5/user/lab5/apps/init.c

@@ -148,6 +148,9 @@ static char *match_builtin_command_param(char *complement, int complement_time,
     if (matched) {
         // 如果匹配到，就进行拼接
         memcpy(buf, complement, start_pos);
+        if (buf[start_pos - 1] != ' ') {
+            buf[start_pos++] = ' ';
+        }
         strcpy(buf + start_pos, matched);
         return buf;
     }