Program: 92145
Project: 92145
Buggy source:
/** 
 * Creates an acronym from the given text. If every characters in the given text are upper case, then the text is returned unchanged on the assumption that it is already an acronym. Otherwise this method returns a string containing the first character of each word, where the words are separated by the camel case convention, the   {@code '_'} character, or anycharacter which is not a  {@linkplain Character#isUnicodeIdentifierPart(int) Unicodeidentifier part} (including spaces).<p><b>Examples:</b> given  {@code "northEast"}, this method returns   {@code "NE"}. Given   {@code "Open Geospatial Consortium"}, this method returns   {@code "OGC"}.</p>
 * @param text The text for which to create an acronym, or {@code null}.
 * @return The acronym, or {@code null} if the given text was null.
 */
public static CharSequence camelCaseToAcronym(CharSequence text){
  text=trimWhitespaces(text);
  if (text != null && !isUpperCase(text,0,text.length())) {
    final int length=text.length();
    final StringBuilder buffer=new StringBuilder(8);
    boolean wantChar=true;
    for (int i=0; i < length; ) {
      final int c=codePointAt(text,i);
      if (wantChar) {
        if (isUnicodeIdentifierStart(c)) {
          buffer.appendCodePoint(c);
          wantChar=false;
        }
      }
 else       if (!isUnicodeIdentifierPart(c) || c == '_') {
        wantChar=true;
      }
 else       if (Character.isUpperCase(c)) {
        if (isLowerCase(buffer.codePointBefore(buffer.length()))) {
          buffer.appendCodePoint(c);
        }
      }
      i+=charCount(c);
    }
    final int acrlg=buffer.length();
    if (acrlg != 0) {
      if (isUpperCase(buffer,1,acrlg)) {
        final int c=buffer.codePointAt(0);
        final int up=toUpperCase(c);
        if (c != up) {
          StringBuilders.replace(buffer,0,charCount(c),toChars(up));
        }
      }
      if (!equals(text,buffer)) {
        text=buffer;
      }
    }
  }
  return text;
}

Fixed version (ground truth):
/** 
 * Creates an acronym from the given text. If every characters in the given text are upper case, then the text is returned unchanged on the assumption that it is already an acronym. Otherwise this method returns a string containing the first character of each word, where the words are separated by the camel case convention, the   {@code '_'} character, or anycharacter which is not a  {@linkplain Character#isUnicodeIdentifierPart(int) Unicodeidentifier part} (including spaces).<p><b>Examples:</b> given  {@code "northEast"}, this method returns   {@code "NE"}. Given   {@code "Open Geospatial Consortium"}, this method returns   {@code "OGC"}.</p>
 * @param text The text for which to create an acronym, or {@code null}.
 * @return The acronym, or {@code null} if the given text was null.
 */
public static CharSequence camelCaseToAcronym(CharSequence text){
  text=trimWhitespaces(text);
  if (text != null && !isUpperCase(text,0,text.length())) {
    final int length=text.length();
    final StringBuilder buffer=new StringBuilder(8);
    boolean wantChar=true;
    for (int i=0; i < length; ) {
      final int c=codePointAt(text,i);
      if (wantChar) {
        if (isUnicodeIdentifierStart(c)) {
          buffer.appendCodePoint(c);
          wantChar=false;
        }
      }
 else       if (!isUnicodeIdentifierPart(c) || c == '_') {
        wantChar=true;
      }
 else       if (Character.isUpperCase(c)) {
        if (!Character.isUpperCase(Character.codePointBefore(text,i))) {
          buffer.appendCodePoint(c);
        }
      }
      i+=charCount(c);
    }
    final int acrlg=buffer.length();
    if (acrlg != 0) {
      if (isUpperCase(buffer,1,acrlg)) {
        final int c=buffer.codePointAt(0);
        final int up=toUpperCase(c);
        if (c != up) {
          StringBuilders.replace(buffer,0,charCount(c),toChars(up));
        }
      }
      if (!equals(text,buffer)) {
        text=buffer;
      }
    }
  }
  return text;
}