Fix path_free() not actually NULL-ing the pointer

README.md

@@ -24,14 +24,14 @@ int main() {
     char* parent = path_parent(path);
     printf("Parent: %s\n", parent);
 
-    path_free(path);
+    path_free(&path);
 
     char* parent_of_parent = path_parent(parent);
     printf("Parent of parent: %s\n", parent_of_parent);
     
-    path_free(parent);
-    path_free(parent_of_parent);
-
+    path_free(&parent);
+    path_free(&parent_of_parent);
+    
     return EXIT_SUCCESS;
 }
 ```

libpath.c

@@ -124,9 +124,9 @@ char* path_join(unsigned int count, ...) {
 }
 
 // Frees path and sets pointer to NULL
-void path_free(char* path) {
-    free(path);
-    path = NULL;
+void path_free(char** path) {
+    free(*path);
+    *path = NULL;
 }
 
 /*
@@ -171,7 +171,8 @@ char* path_parent(const char* path) {
     base_path[last_separator_index] = '\0';
 
     // free temporary cleaned path
-    path_free(clean_path);
+    path_free(&clean_path);
 
     return base_path;
-}
+}
+

libpath.h

@@ -32,10 +32,10 @@ Be sure to path_free() after use.
 char* path_join(unsigned int count, ...);
 
 // Frees path and sets pointer to NULL
-void path_free(char* path);
+void path_free(char** path);
 
 /*
 Creates a new path pointing to the parent.
 Be sure to path_free() on the base as well after use.
 */
-char* path_parent(const char* path);
+char* path_parent(const char* path);

test.c

@@ -22,13 +22,13 @@ int main() {
     char* parent = path_parent(path);
     printf("Parent: %s\n", parent);
 
-    path_free(path);
+    path_free(&path);
 
     char* parent_of_parent = path_parent(parent);
     printf("Parent of parent: %s\n", parent_of_parent);
     
-    path_free(parent);
-    path_free(parent_of_parent);
+    path_free(&parent);
+    path_free(&parent_of_parent);
     
     return EXIT_SUCCESS;
 }