Thread: Change string inside the function

II need to enter a string and receive the same changed string.

Code:

 #include <stdio.h>
#include <string.h>


char *lerdados(char txt[100],char *ler);

int main ( )
{

char str[100]="casa";
char *lerval;

lerval=&str;

lerdados(str,lerval);

printf("%s)",lerdados );


}

//pass a string to function and return the value changed 
char *lerdados(char txt[100],char *ler)
{

char *pont;
pont=ler;


printf("%s)",ler );

   scanf("%s", pont);

   return *pont;
}

Why does not this work?
Thanks