Concatenate 5 string at once

[system]

Good afternoon

I've did some checks more...
Please read the text in bold.

char *concatena5(char *string1, char *string2, char *string3, char *string4, char *string5) {

strcpy(StringFinal, string1);
strcat(StringFinal, string2);
strcat(StringFinal, string3);
strcat(StringFinal, string4);

Serial.println("ini");
Serial.println(string5);
strcat(StringFinal, string5);

//### the application blows up here!, because on serial I just have:
ini
21:43:
fim1 and fim2 don't appear on serial

Serial.println("fim1");
Serial.println(string5);
Serial.println("fim2");
return(StringFinal);
}

Thanks on advance
Best regards
Pedro Ferrer