Add hashmap create and destroy methods

hashtable.c

@@ -9,11 +9,22 @@
 #include <string.h>
 
 hm *hm_create(unsigned int length) {
-    return NULL;
+    hm *hashmap = malloc(sizeof(hm));
+    hashmap->length = length;
+    hashmap->entries = malloc(sizeof(entry) * length);
+    for (int i = 0; i < length; i++) {
+        hashmap->entries[i] = malloc(sizeof(entry));
+    }
+
+    return hashmap;
 }
 
 void hm_destroy(hm **hm) {
-
+    for (int i = 0; i < (*hm)->length; i++) {
+        free((*hm)->entries[i]);
+    }
+    free((*hm)->entries);
+    free((*hm));
 }
 
 hm *hm_set(hm *hm, const char *const key, const char *const value) {

main.c

@@ -5,7 +5,11 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include "hashtable.h"
 
 int main() {
+    hm *hashmap = hm_create(10);
+    hm_destroy(&hashmap);
+
     return EXIT_SUCCESS;
 }