View Compilation Error

0_0_39093548_17377.cpp: In function 'long long int C(long long int, long long int)':
0_0_39093548_17377.cpp:8:4: error: 'Muti' was not declared in this scope
    8 |  a=Muti(n);b=Muti(m);c=Muti(n-m);
      |    ^~~~