コードを再帰処理を用いて書き換えてください。
def get_space_permutations(string):
    # Base case
    if len(string) == 0:
        return [""]
    
    # Remove the first character,
    char = string[0]
    remainder = string[1:]
    
    # Make the permutation
    permutations = []
    for perm in get_space_permutations(remainder):
        permutations += [char + perm, " " + char + perm]
    
    return permutations
def get_space_permutations(string):
    # Base case
    if len(string) == 0:
        return [""]
    
    # Remove and save the first character,
    char = string[0]
    remainder = string[1:]
    
    # Make the permutation
    permutations = []
    for perm in get_space_permutations(remainder):
        permutations += [char + perm, " " + char + perm]
    
    # Recursively call the get_space_permutations() with the remaining string
    newPermutations = get_space_permutations(remainder)

    # Join the new permutation with the current one
    permutations += newPermutations
    
    return permutations