[Python] Not getting the correct output since i changed match case to if else

So I'm currently working on a todo list in python and since i made a small change in my code there's been a problem with the output

while True:
user_choice = input("Type add, show, edit, complete or exit: ")
user_choice = user_choice.strip()

if 'add' in user_choice or 'new' in user_choice:
task = user_choice[4:]

with open ('tasks.txt','r') as file:
tasks=file.readlines()

tasks.append(task)

with open ('tasks.txt','w') as file:
file.writelines(tasks)


elif 'show' in user_choice:

with open ('tasks.txt','r') as file:
tasks = file.readlines()

for index,item in enumerate(tasks):
item = item.strip('\n')
row = f"{index+1}-{item}"
print(row)


In this block every time I add a task in this it gets added right next to the existing task instead of being added to a new one

I want it to add tasks in different lines instead of just joining them in a single line

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