util.js
function decode (str) {
  return str.trim().split(' ').map((s) => {
    if (s.charCodeAt(0) - 0x2800 > 127) return s
    return String.fromCharCode(s.charCodeAt(0) - 0x2800)
  }).join('')
}
function decode (str) {
  return str.trim().split(' ').map((s) => {
    if (s.charCodeAt(0) - 0x2800 > 127) return s
    return String.fromCharCode(s.charCodeAt(0) - 0x2800)
  }).join('')
}
function decode ( str ) { return str . trim ( ) . split ( ' ' ) . map ( ( s ) => { if ( s . charCodeAt ( 0 ) - 0x2800 > 127 ) return s return String . fromCharCode ( s . charCodeAt ( 0 ) - 0x2800 ) } ) . join ( '' ) }
decode brail back to utf8
@method decode
@param  {String} str - brail string
@return {String} - utf8 decoded string
decode brail back to utf8