helpers.c:30:5: error: control may reach end of non-void function [-Werror,-Wreturn-type]
    }
    ^
helpers.c:60:1: error: control may reach end of non-void function [-Werror,-Wreturn-type]
}
^
helpers.c:79:5: error: expected identifier or '('
    return false;
    ^
helpers.c:80:5: error: extraneous closing brace ('}')
    }
    ^
helpers.c:85:6: error: conflicting types for 'sort'
void sort(int values, int n)
     ^
./helpers.h:17:6: note: previous declaration is here
void sort(int values[], int n);
     ^