编写一个Python函数，将两个列表合并为一个，并去重重复项。


lst1 = [1, 2, 3, 4]
lst2 = [3, 4, 5, 6]
```
def merge_and_remove_duplicates(lst1, lst2):
    # 使用 set 将两个列表合并并去重
    merged_lst = set(lst1 + lst2)
    # 将 set 转换回列表并返回
    return list(merged_lst)

lst1 = [1, 2, 3, 4]
lst2 = [3, 4, 5, 6]
merged_lst = merge_and_remove_duplicates(lst1, lst2)
print(merged_lst) # 输出 [1, 2, 3, 4, 5, 6]
```