char **strv_merge(char **a, char **b);
char **strv_merge_concat(char **a, char **b, const char *suffix);
char **strv_append(char **l, const char *s);
char **strv_merge(char **a, char **b);
char **strv_merge_concat(char **a, char **b, const char *suffix);
char **strv_append(char **l, const char *s);