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const char pointer: const char *

The chars the pointer points to cannot be modified.

const pointer to char: char * const

The address the pointer points to cannot be modified.

Easy way to remember this, since it is somewhat confusing at times:

get the type near to the keyword const

1) const char *ptr ==> const char ==> the character value (to which this pointer points) is constant.
2) char * const ptr ===> const * ==> the pointer is constant and can point to only one memory when it was initialized.

Read right to left.

const char * p = "p is a pointer to char which is constant"
char * const p = "p is a constant pointer to a char"

const char *p, char * const p
first is constant character pointer, the value pointed by p is constant.
second one is a constant pointer to character, where the value of p (address) is constant.