makeSkin function
Implementation
String makeSkin(String maskID, Color color) => '''
<g
id="Skin"
mask="url(#$maskID)"
fill="${color.toHex()}">
<g transform="translate(0.000000, 0.000000)" id="Color">
<rect x="0" y="0" width="264" height="280" />
</g>
</g>
''';