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# Check to see if a string has the same amount of 'x's and 'o's. The method must return a boolean and be case insensitive. The string can contain any char.
# Examples input/output:
# XO("ooxx") => true
# XO("xooxx") => false
# XO("ooxXm") => true
# XO("zpzpzpp") => true // when no 'x' and 'o' is present should return true