public static boolean equalsIgnoreCase(final String s1, final String s2) {
    """
	<p>
	Compares two CharSequences, returning {@code true} if they represent
	equal sequences of characters, ignoring case.
	</p>
	
	<p>
	{@code null}s are handled without exceptions. Two {@code null} references
	are considered equal. Comparison is case insensitive.
	</p>
	
	<pre>
	StringUtils.equalsIgnoreCase(null, null)   = true
	StringUtils.equalsIgnoreCase(null, "abc")  = false
	StringUtils.equalsIgnoreCase("abc", null)  = false
	StringUtils.equalsIgnoreCase("abc", "abc") = true
	StringUtils.equalsIgnoreCase("abc", "ABC") = true
	</pre>
    """
        if (s1 == null || s2 == null) {
            return s1 == s2;
        } else if (s1 == s2) {
            return true;
        } else if (s1.length() != s2.length()) {
            return false;
        } else {
            return s1.equals(s2);
        }
    }
public static boolean equalsIgnoreCase(final String s1, final String s2) {
        if (s1 == null || s2 == null) {
            return s1 == s2;
        } else if (s1 == s2) {
            return true;
        } else if (s1.length() != s2.length()) {
            return false;
        } else {
            return s1.equals(s2);
        }
    }
public static boolean equalsIgnoreCase ( final String s1 , final String s2 ) { if ( s1 == null || s2 == null ) { return s1 == s2 ; } else if ( s1 == s2 ) { return true ; } else if ( s1 . length ( ) != s2 . length ( ) ) { return false ; } else { return s1 . equals ( s2 ) ; } }
<p>
Compares two CharSequences, returning {@code true} if they represent
equal sequences of characters, ignoring case.
</p>

<p>
{@code null}s are handled without exceptions. Two {@code null} references
are considered equal. Comparison is case insensitive.
</p>

<pre>
StringUtils.equalsIgnoreCase(null, null)   = true
StringUtils.equalsIgnoreCase(null, "abc")  = false
StringUtils.equalsIgnoreCase("abc", null)  = false
StringUtils.equalsIgnoreCase("abc", "abc") = true
StringUtils.equalsIgnoreCase("abc", "ABC") = true
</pre>
<p > Compares two CharSequences returning { @code true } if they represent equal sequences of characters ignoring case . < / p >