Clean useless varaibles

@@ -6,14 +6,9 @@
 #include <libgen.h> //basename
 
 int main(int argc, char** argv){
-    char const  *period_str, *text, *gain_str;
-    char const *channel_name, *filename, *time_str;
-    char const *number_str;
+    char const  *period_str, *gain_str;
+    char const *channel_name;
     char  *default_output;
-    int number, ret;
-    uint64_t executing_time, previous_executing_time;
-    size_t linecap=0;
-    ssize_t line_size;
     blc_channel channel;
     float gain;
     int  fd;