Nothing
library(datamart)
test_strhead <- function() {
print(strhead(""))
print(strhead("", -10))
print(strhead("abc"))
print(strhead("abc",-1))
print(strhead("abc",-2))
print(strhead("abc",-3))
print(strhead("abc",-4))
print(strhead("abc",1))
print(strhead("abc",2))
print(strhead("abc",3))
print(strhead("abc",4))
}
test_strhead()
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