update: refactor and rename

src/lock.c

@@ -4,14 +4,14 @@
 #include <fcntl.h>
 #include <unistd.h>
 
-lock_st lock() {
-  if (exists(mc_lock_path))
+lock_st lock(char *lock_path) {
+  if (exists(lock_path))
     return ALREADY_LOCKED;
-  if (creat(mc_lock_path, 0600) == -1)
+  if (creat(lock_path, 0600) == -1)
     return LOCK_ERROR;
   return LOCK_SUCCESS;
 }
 
-void unlock() {
-  unlink(mc_lock_path);
+void unlock(char *lock_path) {
+  unlink(lock_path);
 }