// Replace letters
@function str-replace($string, $search, $replace: '') {
  $index: str-index($string, $search);

  @if $index {
    @return str-slice($string, 1, $index - 1) + $replace + str-replace(str-slice($string, $index + str-length($search)), $search, $replace);
  }

  @return $string;
}

// Encode symbols
@function url-encode($string) {
  $map: (
          "%": "%25",
          "<": "%3C",
          ">": "%3E",
          " ": "%20",
          "!": "%21",
          "*": "%2A",
          "'": "%27",
          '"': "%22",
          "(": "%28",
          ")": "%29",
          ";": "%3B",
          ":": "%3A",
          "@": "%40",
          "&": "%26",
          "=": "%3D",
          "+": "%2B",
          "$": "%24",
          ",": "%2C",
          "/": "%2F",
          "?": "%3F",
          "#": "%23",
          "[": "%5B",
          "]": "%5D"
  );

  $new: $string;

  @each $search, $replace in $map {
    $new: str-replace($new, $search, $replace);
  }

  @return $new;
}

// Format the SVG as a URL
@function inline-svg($string) {
  @return url('data:image/svg+xml,#{url-encode($string)}');
}