raw = """animal
    carnivorous
        tiger
        lion
    vegetarian
        cow
        sheep
plant
    algea
    tree
        leaf
        pine
    fungus
        good
        bad
            evil
            mean
    cactus
        big
        small"""

lines = raw.split('n')
indents = [(0,0,'root')]
for a in raw.split('n'):
    indent = 0
    while a[indent] == ' ': indent+=1
    if indent % 4:
        print("not multiple of 4")
        break
    indents.append((len(indents), int(indent/4)+1,a.replace('  ','')))
for a in indents: print(a)

stack=[indents[0]]
entries =[indents[0]]

prev_indent = 0
for item in indents[1:]:
    print("#########################")
    id, indent, name = item
    diff = indent - prev_indent
    print(item)
    print("diff",diff, [a[2] for a in stack])

    if diff>0:
        entries.append(item+(stack[-1][2],))
    elif diff<0:
        # entries.append(item+(stack[-diff][2],))
        count = -diff
        while count>-1: stack.pop();count-=1
        entries.append(item+(stack[-1][2],))
    elif diff==0:
        stack.pop()
        entries.append(item+(stack[-1][2],))
    stack.append(item)
    prev_indent = entries[-1][1]

    print("result", entries[-1])
print("########################")


for a in entries:
    if len (a) == 3: continue
    ident, level, name, parent = a
    print(level*' '*4, name, '(', parent, ')')

animal ( root )
    carnivorous ( animal )
        tiger ( carnivorous )
        lion ( carnivorous )
    vegetarian ( animal )
        cow ( vegetarian )
        sheep ( vegetarian )
plant ( root )
    algea ( plant )
    tree ( plant )
        leaf ( tree )
        pine ( tree )
    fungus ( plant )
        good ( fungus )
        bad ( fungus )
            evil ( bad )
            mean ( bad )
    cactus ( plant )
        big ( cactus )
        small ( cactus )