Rename c to char

lib/src/ui/render.dart

@@ -580,19 +580,20 @@ class RenderTerminal extends RenderBox with RelayoutWhenSystemFontsChangeMixin {
         italic: cellFlags & CellFlags.italic != 0,
         underline: cellFlags & CellFlags.underline != 0,
       );
+
       // Flutter does not draw an underline below a space which is not between
       // other regular characters. As only single characters are drawn, this
       // will never produce an underline below a space in the terminal. As a
       // workaround the regular space CodePoint 0x20 is replaced with
       // the CodePoint 0xA0. This is a non breaking space and a underline can be
       // drawn below it.
-      var c = String.fromCharCode(charCode);
+      var char = String.fromCharCode(charCode);
       if (cellFlags & CellFlags.underline != 0 && charCode == 0x20) {
-        c = String.fromCharCode(0xA0);
+        char = String.fromCharCode(0xA0);
       }
 
       paragraph = _paragraphCache.performAndCacheLayout(
-        c,
+        char,
         style,
         hash,
       );