char array, string literal, const

1.

char string[] = "String literal";
string[0] = '[';

everything compiles; then seg fault.

2.
    char* string1  = "String literal"
    string1[0] = '[';
    printf("%c\n", string1[0]);

compiles; prints

3.
  char *p = "ab" ; // string literal, stores in read-only
  char p[] = "ab"; //can be manipulated
  char *p = (char []){'a', 'b', '\0'};
A character string literal is a sequence of zero or more multibyte characters enclosed in double-quotes
http://stackoverflow.com/questions/30533439/string-literals-vs-array-of-char-when-initializing-a-pointer

compilers replace string literals wtih pointers.