public static String trimStart( final String source, char c ) {
    if ( source == null ) {
      return null;
    }

    int length = source.length();
    int index = 0;

    while ( index < length && source.charAt( index ) == c ) {
      index++;
    }

    return source.substring( index );
  }
@Test
  public void testTrimStart_None() {
    assertEquals( "file/path/", StringUtil.trimStart( "file/path/", '/' ) );
  }