All test cases not passing some are passing

#1

i feel that i i applied straight forward wrong approach ,please help me correct it

#2

the code you have provided does not perform modular exponentiation, please read more about modular exponentiation
code

#3

thank you but (a*a)%c, b/2, c) what is happening here why we did this??

#4

we are just diving the exponent by 2 and squaring the base at the same time. it based of princlpe that (2)^4 is equal to (2^2)^2