How to merge two strings

Hi r-help,

A very simple question for which I have not been able to find an answer
in the docs:

How can I merge two character strings?

I am searching for the equivalent of the (non-existing) stringmerge
function illustrated below:

s1 <- "R-"
s2 <- "project"
stringmerge(s1,s2)

[1] "R-project"