my_strcpy.c

#include <stdio.h>

char* my_strcpy(char* to, const char* from) {
  size_t i;
  for (i = 0; from[i] != '\0'; i++) {
    to[i] = from[i];
  }
  to[i] = '\0';
  return to;
}

int main() {
  char a[20];
  my_strcpy(a, "INIAD");
  printf("%s\n",a);
  return 0;
}