feat(string): implemented append function

Include/Fledasty/Strings/String.h

@@ -38,4 +38,6 @@ typedef struct {
 
 FledastyError fledasty_string_free(FledastyString *current_string);
 
+FledastyError fledasty_string_append(FledastyString *current_string, char *character_string, const size_t character_string_size);
+
 #endif

Src/Strings/String.c

@@ -41,3 +41,25 @@ FledastyError fledasty_string_free(FledastyString *current_string) {
     current_string->character_string = NULL;
     return FLEDASTY_ERROR_NONE;
 }
+
+FledastyError fledasty_string_append(FledastyString *current_string, char *character_string, const size_t character_string_size) {
+    if (current_string == NULL || character_string == NULL || character_string_size == 0) {
+        return FLEDASTY_ERROR_INVALID_POINTER;
+    }
+
+    if (current_string->capacity <= current_string->size + character_string_size) {
+        current_string->capacity += (current_string->capacity > character_string_size) ? current_string->capacity : character_string_size + 1;
+        current_string->character_string = (char*)hallocy_realloc(current_string->character_string, current_string->capacity * sizeof(unsigned char));
+
+        if (current_string->character_string == NULL) {
+            return FLEDASTY_ERROR_FAILED_ALLOCATION;
+        }
+    }
+
+    hallocy_copy_memory(current_string->character_string + current_string->size, character_string, character_string_size);
+
+    current_string->size += character_string_size;
+    current_string->character_string[current_string->size] = '\0';
+
+    return FLEDASTY_ERROR_NONE;
+}

Tests/Main.c

@@ -284,6 +284,8 @@ int main() {
     fledasty_utf8_string_free(&test_utf8_string);
 
     FledastyString normal_test_string = { 0, 0, NULL };
+    fledasty_string_append(&normal_test_string, "Testing", 7);
+    printf("%s\n", normal_test_string.character_string);
 
     fledasty_string_free(&normal_test_string);
     printf("Done\n");