Added unit tests for BigInt data type and updated docs

src/bigint.c

@@ -1854,4 +1854,4 @@ bigint_result_t bigint_printf(const char *format, ...) {
     SET_MSG(result, "Printf completed successfully");
 
     return result;
-}
+}

src/bigint.h

@@ -61,4 +61,4 @@ bigint_result_t bigint_printf(const char *format, ...);
 }
 #endif
 
-#endif
+#endif

src/map.c

@@ -37,7 +37,7 @@ uint64_t hash_key(const char *key) {
  *
  * Returns a map_result_t data type containing a new hash map
  */
-map_result_t map_new() {
+map_result_t map_new(void) {
     map_result_t result = {0};
 
     map_t *map = malloc(sizeof(map_t));

src/map.h

@@ -53,7 +53,7 @@ typedef struct {
 extern "C" {
 #endif
 
-map_result_t map_new();
+map_result_t map_new(void);
 map_result_t map_add(map_t *map, const char *key, void *value);
 map_result_t map_get(const map_t *map, const char *key);
 map_result_t map_remove(map_t *map, const char *key);