remove string from string c

1/*The logic behind the function is to copy and place the ending part of string
2along with the deliminator '\0' to the position from where you want the 
3"no_of_char" number of characters removed*/
4
5void delchar(char *string,int starting_pos, int no_of_char)
6{
7  if (( starting_pos + no_of_char - 1 ) <= strlen(x) )
8  {
9    strcpy(&x[starting_pos-1],&x[starting_pos + no_of_char-1]);
10    puts(x);
11    }
12}

1#include <string.h>
2
3char *strremove(char *str, const char *sub) {
4    size_t len = strlen(sub);
5    if (len > 0) {
6        char *p = str;
7        while ((p = strstr(p, sub)) != NULL) {
8            memmove(p, p + len, strlen(p + len) + 1);
9        }
10    }
11    return str;
12}
13