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#include <stdio.h>
#include <string.h>
 
char lastName(char* name);
 
int main(){
 
	char* start[10];
	char* name[20];
 
	printf("Type your first name: ");
	scanf(" %s", &start);
	strcpy(name, start);
 
	printf("\n");
 
	if(strlen(name) > 0){
		lastName(name);
	}
}
 
char lastName(char* name){
 
	char* last[20];
	int length;
	printf("Type your last name: ");
	scanf(" %s", &last);
	printf("\n");
	strcat(name, last);
	length = strlen(name);
	printf("Your full name is %s and it has %d characters," &name, length);
}

prog.c: In function 'main':
prog.c:12:8: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char * (*)[10]' [-Wformat=]
  scanf(" %s", &start);
        ^
prog.c:13:9: warning: passing argument 1 of 'strcpy' from incompatible pointer type [-Wincompatible-pointer-types]
  strcpy(name, start);
         ^
In file included from prog.c:2:0:
/usr/include/string.h:129:14: note: expected 'char * restrict' but argument is of type 'char **'
 extern char *strcpy (char *__restrict __dest, const char *__restrict __src)
              ^
prog.c:13:15: warning: passing argument 2 of 'strcpy' from incompatible pointer type [-Wincompatible-pointer-types]
  strcpy(name, start);
               ^
In file included from prog.c:2:0:
/usr/include/string.h:129:14: note: expected 'const char * restrict' but argument is of type 'char **'
 extern char *strcpy (char *__restrict __dest, const char *__restrict __src)
              ^
prog.c:17:12: warning: passing argument 1 of 'strlen' from incompatible pointer type [-Wincompatible-pointer-types]
  if(strlen(name) > 0){
            ^
In file included from prog.c:2:0:
/usr/include/string.h:399:15: note: expected 'const char *' but argument is of type 'char **'
 extern size_t strlen (const char *__s)
               ^
prog.c:18:12: warning: passing argument 1 of 'lastName' from incompatible pointer type [-Wincompatible-pointer-types]
   lastName(name);
            ^
prog.c:4:6: note: expected 'char *' but argument is of type 'char **'
 char lastName(char* name);
      ^
prog.c: In function 'lastName':
prog.c:27:8: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char * (*)[20]' [-Wformat=]
  scanf(" %s", &last);
        ^
prog.c:29:15: warning: passing argument 2 of 'strcat' from incompatible pointer type [-Wincompatible-pointer-types]
  strcat(name, last);
               ^
In file included from prog.c:2:0:
/usr/include/string.h:137:14: note: expected 'const char * restrict' but argument is of type 'char **'
 extern char *strcat (char *__restrict __dest, const char *__restrict __src)
              ^
prog.c:31:58: error: invalid operands to binary & (have 'char *' and 'char *')
  printf("Your full name is %s and it has %d characters," &name, length);
                                                          ^
prog.c:32:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

Standard output is empty