CHORE: Bug fixing. Major changes to bugs and also unit testing

tests/fuzz_char.c

@@ -0,0 +1,46 @@
+#include <stddef.h>
+#include <stdint.h>
+
+#include "char/char.h"
+#include "utils/utils.h"
+
+int
+LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
+{
+	if (size < 2) return 0;
+
+	err_t err = ERR_T_INIT;
+	_VecCharInternal vec = VEC_INIT;
+
+	// Use input bytes to drive arbitrary vector operations
+	for (size_t i = 0; i < size; i++)
+	{
+		uint8_t op = data[i] % 5;
+		switch (op)
+		{
+			case 0:
+				_vec_char_push_back(&vec, (char)data[i], &err);
+				break;
+			case 1:
+				_vec_char_pop_back(&vec, &err);
+				break;
+			case 2:
+				if (vec._internal_size > 0)
+				{
+					size_t idx = (size_t)data[i] %
+						     vec._internal_size;
+					_vec_char_erase(&vec, idx, &err);
+				}
+				break;
+			case 3:
+				_vec_char_reserve(&vec, (size_t)data[i], &err);
+				break;
+			case 4:
+				_vec_char_shrink_to_fit(&vec, &err);
+				break;
+		}
+	}
+
+	_vec_char_delete(&vec, &err);
+	return 0;
+}