string timeConversion(string s) {

int i;
int h1 = (int)s[1] - '0';
int h2 = (int)s[0] - '0';
int hh = (h2 * 10 + h1 % 10);
string t,l;
t=s;

t[9]='\0';
t[8]='\0';

if (s[8] == 'A')
{
    if (hh == 12)
    {
        t[0]='0';
        t[1]='0';
    }
    else
    {

    }
}

// If time is in "PM" else { if (hh == 12) {

    }
    else
    {
        hh = hh + 12;
        l=to_string(hh);
        t[0]=l[0];
        t[1]=l[1];
    }
}

return t;

}

Why is this wrong??

Why is this wrong??Why is this wrong??