IStringMap multi-line string of key-values

[Kevin]

in first method your format is incorrect

should be

str Av=
 "1 hello
 1 world"

str B="2 key"
str Bv=
 "2 hello
 2 world"

str C="3 key"
str Cv=
 "3 hello
 3 world"

second method will work as well