Description: 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 XO("zzoo") => false Solution: Check if 'str' contains 'o' and 'x' respect..