Sway strings are declared using double-quotes ". Single quotes ' cannot be used. Attempting to define a string with single-quotes will result in an error.
{{#include ../../../code/misc/known-issues/string_issue/src/lib.sw:single_quotes}}Strings are UTF-8 encoded therefore they cannot be indexed.
{{#include ../../../code/misc/known-issues/string_issue/src/lib.sw:indexing}}