/guava/guava/src/com/google/common/base/CharMatcher.java
if ( replacementLen == 1) {   return replaceFrom( sequence, replacement.charAt( 0) ) ; }
[Delete]
public String replaceFrom(CharSequence sequence, CharSequence replacement) { int replacementLen = replacement.length(); if (replacementLen == 0) { return removeFrom(sequence); } if (replacementLen == 1) { <extra_id_0> } String string = sequence.toString(); int pos = indexIn(string); if (pos == -1) { return string; }