Use a real hashing function.

src/hashtable-simple.c

@@ -15,7 +15,13 @@ typedef struct {
 } HASHTABLE;
 
 int hash_of_key(HASHTABLE* hashtable, char * key) {
-	return 0;
+	int val=0;
+	int idx=0;
+	while (key[idx] != '\0') {
+		val ^= key[idx];
+		idx++;
+	}
+	return (val % hashtable->capacity);
 }
 
 HASHTABLE* hashtable_create(int capacity) {
@@ -88,7 +94,7 @@ int hashtable_set(HASHTABLE* hashtable, char* key, void * value) {
 				(void*)cell->value,
 				(void*)cell->next);
 	}
-	printf("hashtable_set -- done\n");
+	printf("hashtable_set(...) -- done\n");
 
 	return 0;
 }
@@ -98,6 +104,7 @@ void * hashtable_get(HASHTABLE* hashtable, char* key) {
 	HASHCELL* cell;
 	printf("hashtable_get(%p, %p) -- \n", hashtable, key);
 	idx = hash_of_key(hashtable, key);
+	printf("hashtable_get(...) -- index [%d/%d]\n", idx, hashtable->capacity);
 	cell = hashtable->data[idx];
 	while(cell) {
 		printf("hashtable_get(...) -- cell@%p{key=%s, value=%p, next=%p}\n", 
@@ -134,6 +141,7 @@ int main(int argc, char** argv) {
 	printf("h['charlie'] <- %d\n", z);
 	hashtable_set(hashtable, "alice", &y);
 	printf("h['alice'] <- %d\n", y);
+
 	value = hashtable_get(hashtable, "alice"); 
 	printf("h['alice'] ? %d\n", *value);
 	value = hashtable_get(hashtable, "bob");