Constructor cannot be redeclared - was mache ich falsch?

Code: CPP

class automobil{
private:
    int anzahl = 0;
    string marke = "";
    string klasse = "";
public:
    automobil():automobil(0L, "", ""){};
    automobil(int a):automobil(a, "", ""){};
    automobil(string m):automobil(0L, m, ""){};
    [b]automobil(string k):automobil(0L, "", k){};[/b]
    automobil(int, string, string);
    
    void set_anzahl(int a);
    void set_marke(string m);
    void set_klasse(string k);
    void init(int a, string m, string k);
    int get_anzahl();
    string get_marke();
    string get_klasse();
};

Code:

Automata::Automata(int a, string n, string m){
    set_anzahl(a);
    set_name(n);
    set_marke(m);
}

Code:

Automata():Automata(0, "", ""){};
    Automata(int, string, string);

Code:

Automat::Automat(unsigned long g, string s){
    set_geld(g);
    set_standort(s);
}

Code:

 Automat():Automat(0, ""){};
    Automat(string s):Automat(0L, s){};
    Automat(unsigned long g):Automat(g, ""){}
    Automat(unsigned long, string);

Code:

Automata():Automata(0, "", ""){};
    Automata(int a):Automata(a, "", ""){};
    Automata(string n):Automata(0L, n, ""){};
    Automata(string n, string m):Automata(0L, n, m){};
    Automata(int, string, string);