Merge pull request 'trim any leading whitespace in the input' (#258) …

…from send-input-fix into master

Reviewed-on: https://git.grassecon.net/urdt/ussd/pulls/258
Reviewed-by: lash <accounts-grassrootseconomics@holbrook.no>

internal/http/at/parse.go

@@ -81,7 +81,8 @@ func (arp *ATRequestParser) GetInput(rq any) ([]byte, error) {
 		return nil, fmt.Errorf("no input found")
 	}
 
-	return []byte(parts[len(parts)-1]), nil
+	trimmedInput := strings.TrimSpace(parts[len(parts)-1])
+	return []byte(trimmedInput), nil
 }
 
 func parseQueryParams(query string) map[string]string {