Whats wrong with my code please?

Question

I ve just written the recursive function to reverse string but in solo it gives me no output ;
Here is my code
def spell(txt):

if len(txt) == 0:
return txt
else:
return spell(txt[1:]) + txt[0]
txt = "hello"
print(spell(txt))
#here try to output
#o
#l and so on
for l in txt:
print(l)
print(spell(l))

Answer 1

it could also be done in this way:

text ="hello"
print("\n".join([char for char in text[::-1]]))

Answer 2

Last line print(spell(txt))

Answer 3

Dear Teacher I do change it many times,but it doesnt work

Answer 4

https://code.sololearn.com/cfSzEoAbPJZh/?ref=app