how to remove part of string in c code example

Example 1: delete string function in c

/*The logic behind the function is to copy and place the ending part of string
along with the deliminator '\0' to the position from where you want the 
"no_of_char" number of characters removed*/

void delchar(char *string,int starting_pos, int no_of_char)
{
  if (( starting_pos + no_of_char - 1 ) <= strlen(x) )
  {
    strcpy(&x[starting_pos-1],&x[starting_pos + no_of_char-1]);
    puts(x);
    }
}

Example 2: remove string from string c

#include <string.h>

char *strremove(char *str, const char *sub) {
    size_t len = strlen(sub);
    if (len > 0) {
        char *p = str;
        while ((p = strstr(p, sub)) != NULL) {
            memmove(p, p + len, strlen(p + len) + 1);
        }
    }
    return str;
}