correct constant

String const correct

Implementation

static const String correct =
    '<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="48" height="48" preserveAspectRatio="xMidYMid meet" viewBox="0 0 48 48"><mask id="svgIDa"><path fill="#555" fill-rule="evenodd" stroke="#fff" stroke-linecap="round" stroke-linejoin="round" stroke-width="4" d="m4 24 5-5 10 10L39 9l5 5-25 25L4 24Z" clip-rule="evenodd"/></mask><path fill="currentColor" d="M0 0h48v48H0z" mask="url(#svgIDa)"/></svg>';