Return True if the string "cat" and "dog" appear the same number of times in the given string. You may not use any built in Python string functions, except for len(). Complete the exercise using a For Loop and a While Loop.

Example: cat_dog('catdog') True

cat_dog('catcat') False

def cat_dog_while(str):

#missing code

def cat_dog_for(str):

missing code

Help me with my python! Thank you so much :)