Given two strings, determine if they are anagrams of each other. Two strings are anagrams if they contain the same characters with the same frequencies, ignoring case and spaces. For null inputs, return false.
Examples:
Input: str1 = 'listen', str2 = 'silent'
Output: true
Explanation: Both strings contain the same letters with the same frequencies
Input: str1 = 'Hello', str2 = 'World'
Output: false
Explanation: Strings contain different letters
Input: str1 = 'Rail Safety', str2 = 'Fairy Tales'
Output: true
Explanation: When ignoring case and spaces, both contain the same letters with the same frequencies
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