Simple concatenate two strings
By Radosław Wielgórski
Simple concatenation of two strings to third one using standard libs. Just put two strings and as function result you got concatenated one.
char*
concat(char* first, char* second) {
char* result = malloc(snprintf(NULL, 0, "%s%s", first, second)+1);
sprintf(result, "%s%s", first, second);
return result;
}