Create a function that returns the smallest number of letter removals so that two strings are anagrams of each other.
min_removals("abcde", "cab") ➞ 2
# Remove "d", "e" to make "abc" and "cab".
min_removals("deafk", "kfeap") ➞ 2
# Remove "d" and "p" from the first and second word, respectively.
min_removals("acb", "ghi") ➞ 6
# Remove all letters from both words to get "" and "".
baedc is an anagram of abcde.