concatinating and removing char from char array in c code example

Example 1: remove first character from string c

if (contents[0] == '\n') 
    memmove(contents, contents+1, strlen(contents));

Example 2: accessing the elements of a char* in c

#include 

int main()
{
    char *p="abcd";
    printf("%c\n", p[0]);
    printf("%c\n", p[1]);
    printf("%c\n", p[2]);
    printf("%c\n", p[3]);
    return 0;
}