--- a/util.h	Tue Feb 06 22:42:16 2018 -0800
+++ b/util.h	Tue Feb 06 22:44:11 2018 -0800
@@ -41,7 +41,7 @@
 //Returns the basename of a path with th extension (if any) stripped
 char * basename_no_extension(char *path);
 //Returns the extension from a path or NULL if there is no extension
-char *path_extension(char *path);
+char *path_extension(char const *path);
 //Returns true if the given path matches one of the extensions in the list
 uint8_t path_matches_extensions(char *path, char **ext_list, uint32_t num_exts);
 //Returns the directory portion of a path or NULL if there is no directory part