original_string: public function setPrefix(string $prefix) : RouterInterface {
          $prefix = trim($prefix, '/');
          $this->prefix = $prefix.(strlen($prefix) ? '/' : '');
          return $this;
      }
code: public function setPrefix(string $prefix) : RouterInterface {
          $prefix = trim($prefix, '/');
          $this->prefix = $prefix.(strlen($prefix) ? '/' : '');
          return $this;
      }
code_tokens: public function setPrefix ( string $ prefix ) : RouterInterface { $ prefix = trim ( $ prefix , '/' ) ; $ this -> prefix = $ prefix . ( strlen ( $ prefix ) ? '/' : '' ) ; return $ this ; }
docstring: Set the prefix for all future URLs, used mainly internally.
  @param  string    $prefix the prefix to prepend
  @return self
docstring_tokens: Set the prefix for all future URLs used mainly internally .