fix(lang: c, chapters: searching, sorting): Some serious errors (#1531)

* fix: correct hash table insertion

* Use a pointer to a pointer instead of a single pointer in the insert function, ensuring proper updates to the hash table
* Bug fixes: This fixes issues with empty results.

* fix: correct issues in radix sort

* Replaced loop-based array copy with memcpy to ensure efficient memory copying in countingSortDigit
* Fixed a bug in radixSort where the maximum value search loop skipped the last element
* Bug fix: Ensures all elements are checked when determining the maximum value in the array

* perf: improve memory management by adding explicit memory release

* revert: Revert to using the old loop override array method and drop specific api's like memcpy.

codes/c/chapter_searching/two_sum.c

@@ -37,12 +37,12 @@ HashTable *find(HashTable *h, int key) {
 }
 
 /* 哈希表元素插入 */
-void insert(HashTable *h, int key, int val) {
-    HashTable *t = find(h, key);
+void insert(HashTable **h, int key, int val) {
+    HashTable *t = find(*h, key);
     if (t == NULL) {
         HashTable *tmp = malloc(sizeof(HashTable));
         tmp->key = key, tmp->val = val;
-        HASH_ADD_INT(h, key, tmp);
+        HASH_ADD_INT(*h, key, tmp);
     } else {
         t->val = val;
     }
@@ -59,7 +59,7 @@ int *twoSumHashTable(int *nums, int numsSize, int target, int *returnSize) {
             *returnSize = 2;
             return res;
         }
-        insert(hashtable, nums[i], i);
+        insert(&hashtable, nums[i], i);
     }
     *returnSize = 0;
     return NULL;
@@ -83,4 +83,4 @@ int main() {
     printArray(res, returnSize);
 
     return 0;
-}
+}