Anagram Checker

Write a function that checks whether two input strings are anagrams of each other. An anagram is a word formed by rearranging the letters of another word, using all original letters exactly once.

Input: Two strings str1 and str2
Output: A boolean value – true if the strings are anagrams, false otherwise.

Example Inputs & Outputs

// Example 1:
Input: ("listen", "silent")
Output: true

// Example 2:
Input: ("hello", "world")
Output: false

// Example 3:
Input: ("Triangle", "Integral")
Output: true

// Example 4:
Input: ("rat", "car")
Output: false

// Example 5:
Input: ("a", "A")
Output: true

// Example 6:
Input: ("dormitory!!", "dirty room")
Output: true

Constraints & Edge Cases

• The comparison should be case-insensitive.
• Both strings may contain non-alphabetic characters (optional: ignore them).
• Empty strings are valid inputs.
• Strings of different lengths can’t be anagrams.
• Whitespaces are ignored and compare only letters