char *b = new char[len + 1]{0};
000007F7891823D0  mov         rax,qword ptr [len]
000007F7891823D5  inc         rax
000007F7891823D8  mov         rcx,rax
000007F7891823DB  call        operator new[] (07F7891848E0h)
000007F7891823E0  mov         qword ptr [rsp+40h],rax
000007F7891823E5  cmp         qword ptr [rsp+40h],0
000007F7891823EB  je          main+61h (07F789182401h)
000007F7891823ED  mov         rax,qword ptr [rsp+40h]
000007F7891823F2  mov         byte ptr [rax],0
000007F7891823F5  mov         rax,qword ptr [rsp+40h]
000007F7891823FA  mov         qword ptr [rsp+50h],rax
000007F7891823FF  jmp         main+6Ah (07F78918240Ah)
000007F789182401  mov         qword ptr [rsp+50h],0
000007F78918240A  mov         rax,qword ptr [rsp+50h]
000007F78918240F  mov         qword ptr [b],rax