B$1$ Given test$\_$Str$.$cpp write the corresponding header file and implementation file $($Str$.$h$,$ Str$.$cpp$).$

$//$ test$\_$Str$.$cpp

#include

#include $"$Str$.$h$"$

using namespace std;

int main$()$

$\{$

Str s$1$;

char courseName$[]="$cpp$"$;

Str s$2($courseName$)$;

Str s$3($s$2)$;

s$2.$print$()$; $//$cpp

s$3.$print$()$; $//$cpp

s$1=$ s$2$; s$1.$print$()$;

$//$cpp

$++$s$1$; s$1.$print$()$;

$//$dqq

s$1[0]=\text{'}$P$\text{'}$; s$1.$print$()$; $//$Pqq

return $0$;

$\}$

Hint: use the followi