Passing blank values in parameters of type "C"

[rpuranda-tibco]

Want to pass a single character as space in input params.
Something like this:
c, _ := gorfc.ConnectionFromParams(abapSystem())
params := map[string]interface{}{
"CALL_RFC":" ",
}
r, e := c.Call("Z_ALLDATATYPE_CLIENT_TEST1", params)
if e != nil {
fmt.Println("Error is:", e)
}
Here after Call, no error is returned and exit status 0xc0000374.
Can you suggest what could be the issue?