add some cosmetic fixes

Author: fUS1ONd

src/comparators.c

@@ -4,9 +4,3 @@
 int compare_asc(const char *a, const char *b) { return strcmp(a, b); }
 
 int compare_des(const char *a, const char *b) { return strcmp(b, a); }
-
-void swap(char **a, char **b) {
-    char *temp = *a;
-    *a = *b;
-    *b = temp;
-}